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References in Research – Types, Examples and Writing Guide

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References in Research

Definition:

References in research are a list of sources that a researcher has consulted or cited while conducting their study. They are an essential component of any academic work, including research papers, theses, dissertations, and other scholarly publications.

Types of References

There are several types of references used in research, and the type of reference depends on the source of information being cited. The most common types of references include:

References to books typically include the author’s name, title of the book, publisher, publication date, and place of publication.

Example: Smith, J. (2018). The Art of Writing. Penguin Books.

Journal Articles

References to journal articles usually include the author’s name, title of the article, name of the journal, volume and issue number, page numbers, and publication date.

Example: Johnson, T. (2021). The Impact of Social Media on Mental Health. Journal of Psychology, 32(4), 87-94.

Web sources

References to web sources should include the author or organization responsible for the content, the title of the page, the URL, and the date accessed.

Example: World Health Organization. (2020). Coronavirus disease (COVID-19) advice for the public. Retrieved from https://www.who.int/emergencies/disease/novel-coronavirus-2019/advice-for-public

Conference Proceedings

References to conference proceedings should include the author’s name, title of the paper, name of the conference, location of the conference, date of the conference, and page numbers.

Example: Chen, S., & Li, J. (2019). The Future of AI in Education. Proceedings of the International Conference on Educational Technology, Beijing, China, July 15-17, pp. 67-78.

References to reports typically include the author or organization responsible for the report, title of the report, publication date, and publisher.

Example: United Nations. (2020). The Sustainable Development Goals Report. United Nations.

Formats of References

Some common Formates of References with their examples are as follows:

APA (American Psychological Association) Style

The APA (American Psychological Association) Style has specific guidelines for formatting references used in academic papers, articles, and books. Here are the different reference formats in APA style with examples:

Author, A. A. (Year of publication). Title of book. Publisher.

Example : Smith, J. K. (2005). The psychology of social interaction. Wiley-Blackwell.

Journal Article

Author, A. A., Author, B. B., & Author, C. C. (Year of publication). Title of article. Title of Journal, volume number(issue number), page numbers.

Example : Brown, L. M., Keating, J. G., & Jones, S. M. (2012). The role of social support in coping with stress among African American adolescents. Journal of Research on Adolescence, 22(1), 218-233.

Author, A. A. (Year of publication or last update). Title of page. Website name. URL.

Example : Centers for Disease Control and Prevention. (2020, December 11). COVID-19: How to protect yourself and others. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html

Magazine article

Author, A. A. (Year, Month Day of publication). Title of article. Title of Magazine, volume number(issue number), page numbers.

Example : Smith, M. (2019, March 11). The power of positive thinking. Psychology Today, 52(3), 60-65.

Newspaper article:

Author, A. A. (Year, Month Day of publication). Title of article. Title of Newspaper, page numbers.

Example: Johnson, B. (2021, February 15). New study shows benefits of exercise on mental health. The New York Times, A8.

Edited book

Editor, E. E. (Ed.). (Year of publication). Title of book. Publisher.

Example : Thompson, J. P. (Ed.). (2014). Social work in the 21st century. Sage Publications.

Chapter in an edited book:

Author, A. A. (Year of publication). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. page numbers). Publisher.

Example : Johnson, K. S. (2018). The future of social work: Challenges and opportunities. In J. P. Thompson (Ed.), Social work in the 21st century (pp. 105-118). Sage Publications.

MLA (Modern Language Association) Style

The MLA (Modern Language Association) Style is a widely used style for writing academic papers and essays in the humanities. Here are the different reference formats in MLA style:

Author’s Last name, First name. Title of Book. Publisher, Publication year.

Example : Smith, John. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Journal article

Author’s Last name, First name. “Title of Article.” Title of Journal, volume number, issue number, Publication year, page numbers.

Example : Brown, Laura M., et al. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence, vol. 22, no. 1, 2012, pp. 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name, Publication date, URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC, 11 Dec. 2020, https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date, page numbers.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, Mar. 2019, pp. 60-65.

Newspaper article

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date, page numbers.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, 15 Feb. 2021, p. A8.

Editor’s Last name, First name, editor. Title of Book. Publisher, Publication year.

Example : Thompson, John P., editor. Social Work in the 21st Century. Sage Publications, 2014.

Chapter in an edited book

Author’s Last name, First name. “Title of Chapter.” Title of Book, edited by Editor’s First Name Last name, Publisher, Publication year, page numbers.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” Social Work in the 21st Century, edited by John P. Thompson, Sage Publications, 2014, pp. 105-118.

Chicago Manual of Style

The Chicago Manual of Style is a widely used style for writing academic papers, dissertations, and books in the humanities and social sciences. Here are the different reference formats in Chicago style:

Example : Smith, John K. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Publication year): page numbers.

Example : Brown, Laura M., John G. Keating, and Sarah M. Jones. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name. Publication date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Example : Thompson, John P., ed. Social Work in the 21st Century. Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Publisher, Publication year.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Sage Publications, 2014.

Harvard Style

The Harvard Style, also known as the Author-Date System, is a widely used style for writing academic papers and essays in the social sciences. Here are the different reference formats in Harvard Style:

Author’s Last name, First name. Year of publication. Title of Book. Place of publication: Publisher.

Example : Smith, John. 2005. The Psychology of Social Interaction. Oxford: Wiley-Blackwell.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Journal volume number (issue number): page numbers.

Example: Brown, Laura M., John G. Keating, and Sarah M. Jones. 2012. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22 (1): 218-233.

Author’s Last name, First name. Year of publication. “Title of Webpage.” Website Name. URL. Accessed date.

Example : Centers for Disease Control and Prevention. 2020. “COVID-19: How to Protect Yourself and Others.” CDC. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html. Accessed April 1, 2023.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Magazine, month and date of publication.

Example : Smith, Mary. 2019. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Newspaper, month and date of publication.

Example : Johnson, Bob. 2021. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Year of publication. Title of Book. Place of publication: Publisher.

Example : Thompson, John P., ed. 2014. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications.

Author’s Last name, First name. Year of publication. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Place of publication: Publisher.

Example : Johnson, Karen S. 2014. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Thousand Oaks, CA: Sage Publications.

Vancouver Style

The Vancouver Style, also known as the Uniform Requirements for Manuscripts Submitted to Biomedical Journals, is a widely used style for writing academic papers in the biomedical sciences. Here are the different reference formats in Vancouver Style:

Author’s Last name, First name. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. 2nd ed. Oxford: Wiley-Blackwell; 2005.

Author’s Last name, First name. Title of Article. Abbreviated Journal Title. Year of publication; volume number(issue number):page numbers.

Example : Brown LM, Keating JG, Jones SM. The Role of Social Support in Coping with Stress among African American Adolescents. J Res Adolesc. 2012;22(1):218-233.

Author’s Last name, First name. Title of Webpage. Website Name [Internet]. Publication date. [cited date]. Available from: URL.

Example : Centers for Disease Control and Prevention. COVID-19: How to Protect Yourself and Others [Internet]. 2020 Dec 11. [cited 2023 Apr 1]. Available from: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. Title of Article. Title of Magazine. Year of publication; month and day of publication:page numbers.

Example : Smith M. The Power of Positive Thinking. Psychology Today. 2019 Mar 1:32-35.

Author’s Last name, First name. Title of Article. Title of Newspaper. Year of publication; month and day of publication:page numbers.

Example : Johnson B. New Study Shows Benefits of Exercise on Mental Health. The New York Times. 2021 Feb 15:A4.

Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014.

Author’s Last name, First name. Title of Chapter. In: Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication. page numbers.

Example : Johnson KS. The Future of Social Work: Challenges and Opportunities. In: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014. p. 105-118.

Turabian Style

Turabian style is a variation of the Chicago style used in academic writing, particularly in the fields of history and humanities. Here are the different reference formats in Turabian style:

Author’s Last name, First name. Title of Book. Place of publication: Publisher, Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. Oxford: Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Year of publication): page numbers.

Example : Brown, LM, Keating, JG, Jones, SM. “The Role of Social Support in Coping with Stress among African American Adolescents.” J Res Adolesc 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Publication date. Accessed date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. Accessed April 1, 2023. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Month Day, Year of publication, page numbers.

Example : Smith, M. “The Power of Positive Thinking.” Psychology Today, March 1, 2019, 32-35.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Month Day, Year of publication.

Example : Johnson, B. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Title of Book. Place of publication: Publisher, Year of publication.

Example : Thompson, JP, ed. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s Last name, First name, page numbers. Place of publication: Publisher, Year of publication.

Example : Johnson, KS. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by Thompson, JP, 105-118. Thousand Oaks, CA: Sage Publications, 2014.

IEEE (Institute of Electrical and Electronics Engineers) Style

IEEE (Institute of Electrical and Electronics Engineers) style is commonly used in engineering, computer science, and other technical fields. Here are the different reference formats in IEEE style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of publication.

Example : Oppenheim, A. V., & Schafer, R. W. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 2010.

Author’s Last name, First name. “Title of Article.” Abbreviated Journal Title, vol. number, no. issue number, pp. page numbers, Month year of publication.

Example: Shannon, C. E. “A Mathematical Theory of Communication.” Bell System Technical Journal, vol. 27, no. 3, pp. 379-423, July 1948.

Conference paper

Author’s Last name, First name. “Title of Paper.” In Title of Conference Proceedings, Place of Conference, Date of Conference, pp. page numbers, Year of publication.

Example: Gupta, S., & Kumar, P. “An Improved System of Linear Discriminant Analysis for Face Recognition.” In Proceedings of the 2011 International Conference on Computer Science and Network Technology, Harbin, China, Dec. 2011, pp. 144-147.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Date of publication or last update. Accessed date. URL.

Example : National Aeronautics and Space Administration. “Apollo 11.” NASA. July 20, 1969. Accessed April 1, 2023. https://www.nasa.gov/mission_pages/apollo/apollo11.html.

Technical report

Author’s Last name, First name. “Title of Report.” Name of Institution or Organization, Report number, Year of publication.

Example : Smith, J. R. “Development of a New Solar Panel Technology.” National Renewable Energy Laboratory, NREL/TP-6A20-51645, 2011.

Author’s Last name, First name. “Title of Patent.” Patent number, Issue date.

Example : Suzuki, H. “Method of Producing Carbon Nanotubes.” US Patent 7,151,019, December 19, 2006.

Standard Title. Standard number, Publication date.

Example : IEEE Standard for Floating-Point Arithmetic. IEEE Std 754-2008, August 29, 2008

ACS (American Chemical Society) Style

ACS (American Chemical Society) style is commonly used in chemistry and related fields. Here are the different reference formats in ACS style:

Author’s Last name, First name; Author’s Last name, First name. Title of Article. Abbreviated Journal Title Year, Volume, Page Numbers.

Example : Wang, Y.; Zhao, X.; Cui, Y.; Ma, Y. Facile Preparation of Fe3O4/graphene Composites Using a Hydrothermal Method for High-Performance Lithium Ion Batteries. ACS Appl. Mater. Interfaces 2012, 4, 2715-2721.

Author’s Last name, First name. Book Title; Publisher: Place of Publication, Year of Publication.

Example : Carey, F. A. Organic Chemistry; McGraw-Hill: New York, 2008.

Author’s Last name, First name. Chapter Title. In Book Title; Editor’s Last name, First name, Ed.; Publisher: Place of Publication, Year of Publication; Volume number, Chapter number, Page Numbers.

Example : Grossman, R. B. Analytical Chemistry of Aerosols. In Aerosol Measurement: Principles, Techniques, and Applications; Baron, P. A.; Willeke, K., Eds.; Wiley-Interscience: New York, 2001; Chapter 10, pp 395-424.

Author’s Last name, First name. Title of Webpage. Website Name, URL (accessed date).

Example : National Institute of Standards and Technology. Atomic Spectra Database. https://www.nist.gov/pml/atomic-spectra-database (accessed April 1, 2023).

Author’s Last name, First name. Patent Number. Patent Date.

Example : Liu, Y.; Huang, H.; Chen, H.; Zhang, W. US Patent 9,999,999, December 31, 2022.

Author’s Last name, First name; Author’s Last name, First name. Title of Article. In Title of Conference Proceedings, Publisher: Place of Publication, Year of Publication; Volume Number, Page Numbers.

Example : Jia, H.; Xu, S.; Wu, Y.; Wu, Z.; Tang, Y.; Huang, X. Fast Adsorption of Organic Pollutants by Graphene Oxide. In Proceedings of the 15th International Conference on Environmental Science and Technology, American Chemical Society: Washington, DC, 2017; Volume 1, pp 223-228.

AMA (American Medical Association) Style

AMA (American Medical Association) style is commonly used in medical and scientific fields. Here are the different reference formats in AMA style:

Author’s Last name, First name. Article Title. Journal Abbreviation. Year; Volume(Issue):Page Numbers.

Example : Jones, R. A.; Smith, B. C. The Role of Vitamin D in Maintaining Bone Health. JAMA. 2019;321(17):1765-1773.

Author’s Last name, First name. Book Title. Edition number. Place of Publication: Publisher; Year.

Example : Guyton, A. C.; Hall, J. E. Textbook of Medical Physiology. 13th ed. Philadelphia, PA: Saunders; 2015.

Author’s Last name, First name. Chapter Title. In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: Page Numbers.

Example: Rajakumar, K. Vitamin D and Bone Health. In: Holick, M. F., ed. Vitamin D: Physiology, Molecular Biology, and Clinical Applications. 2nd ed. New York, NY: Springer; 2010:211-222.

Author’s Last name, First name. Webpage Title. Website Name. URL. Published date. Updated date. Accessed date.

Example : National Cancer Institute. Breast Cancer Prevention (PDQ®)–Patient Version. National Cancer Institute. https://www.cancer.gov/types/breast/patient/breast-prevention-pdq. Published October 11, 2022. Accessed April 1, 2023.

Author’s Last name, First name. Conference presentation title. In: Conference Title; Conference Date; Place of Conference.

Example : Smith, J. R. Vitamin D and Bone Health: A Meta-Analysis. In: Proceedings of the Annual Meeting of the American Society for Bone and Mineral Research; September 20-23, 2022; San Diego, CA.

Thesis or dissertation

Author’s Last name, First name. Title of Thesis or Dissertation. Degree level [Doctoral dissertation or Master’s thesis]. University Name; Year.

Example : Wilson, S. A. The Effects of Vitamin D Supplementation on Bone Health in Postmenopausal Women [Doctoral dissertation]. University of California, Los Angeles; 2018.

ASCE (American Society of Civil Engineers) Style

The ASCE (American Society of Civil Engineers) style is commonly used in civil engineering fields. Here are the different reference formats in ASCE style:

Author’s Last name, First name. “Article Title.” Journal Title, volume number, issue number (year): page numbers. DOI or URL (if available).

Example : Smith, J. R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering, vol. 146, no. 3 (2020): 04020010. https://doi.org/10.1061/(ASCE)EE.1943-7870.0001668.

Example : McCuen, R. H. Hydrologic Analysis and Design. 4th ed. Upper Saddle River, NJ: Pearson Education; 2013.

Author’s Last name, First name. “Chapter Title.” In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: page numbers.

Example : Maidment, D. R. “Floodplain Management in the United States.” In: Shroder, J. F., ed. Treatise on Geomorphology. San Diego, CA: Academic Press; 2013: 447-460.

Author’s Last name, First name. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year: page numbers.

Example: Smith, J. R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019: 156-163.

Author’s Last name, First name. “Report Title.” Report number. Place of Publication: Publisher; Year.

Example : U.S. Army Corps of Engineers. “Hurricane Sandy Coastal Risk Reduction Program, New York and New Jersey.” Report No. P-15-001. Washington, DC: U.S. Army Corps of Engineers; 2015.

CSE (Council of Science Editors) Style

The CSE (Council of Science Editors) style is commonly used in the scientific and medical fields. Here are the different reference formats in CSE style:

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Year;Volume(Issue):Page numbers.

Example : Smith, J.R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering. 2020;146(3):04020010.

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number. Place of Publication: Publisher; Year.

Author’s Last name, First Initial. Middle Initial. “Chapter Title.” In: Editor’s Last name, First Initial. Middle Initial., ed. Book Title. Edition number. Place of Publication: Publisher; Year:Page numbers.

Author’s Last name, First Initial. Middle Initial. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year.

Example : Smith, J.R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019.

Author’s Last name, First Initial. Middle Initial. “Report Title.” Report number. Place of Publication: Publisher; Year.

Bluebook Style

The Bluebook style is commonly used in the legal field for citing legal documents and sources. Here are the different reference formats in Bluebook style:

Case citation

Case name, volume source page (Court year).

Example : Brown v. Board of Education, 347 U.S. 483 (1954).

Statute citation

Name of Act, volume source § section number (year).

Example : Clean Air Act, 42 U.S.C. § 7401 (1963).

Regulation citation

Name of regulation, volume source § section number (year).

Example: Clean Air Act, 40 C.F.R. § 52.01 (2019).

Book citation

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number (if applicable). Place of Publication: Publisher; Year.

Example: Smith, J.R. Legal Writing and Analysis. 3rd ed. New York, NY: Aspen Publishers; 2015.

Journal article citation

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Volume number (year): first page-last page.

Example: Garcia, C. “The Right to Counsel: An International Comparison.” International Journal of Legal Information. 43 (2015): 63-94.

Website citation

Author’s Last name, First Initial. Middle Initial. “Page Title.” Website Title. URL (accessed month day, year).

Example : United Nations. “Universal Declaration of Human Rights.” United Nations. https://www.un.org/en/universal-declaration-human-rights/ (accessed January 3, 2023).

Oxford Style

The Oxford style, also known as the Oxford referencing system or the documentary-note citation system, is commonly used in the humanities, including literature, history, and philosophy. Here are the different reference formats in Oxford style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of Publication.

Example : Smith, John. The Art of Writing. New York: Penguin, 2020.

Author’s Last name, First name. “Article Title.” Journal Title volume, no. issue (year): page range.

Example: Garcia, Carlos. “The Role of Ethics in Philosophy.” Philosophy Today 67, no. 3 (2019): 53-68.

Chapter in an edited book citation

Author’s Last name, First name. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher, Year of Publication.

Example : Lee, Mary. “Feminism in the 21st Century.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press, 2018.

Author’s Last name, First name. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed 3 January 2023).

Dissertation or thesis citation

Author’s Last name, First name. “Title of Dissertation/Thesis.” PhD diss., University Name, Year of Publication.

Example : Brown, Susan. “The Art of Storytelling in American Literature.” PhD diss., University of Oxford, 2020.

Newspaper article citation

Author’s Last name, First name. “Article Title.” Newspaper Title, Month Day, Year.

Example : Robinson, Andrew. “New Developments in Climate Change Research.” The Guardian, September 15, 2022.

AAA (American Anthropological Association) Style

The American Anthropological Association (AAA) style is commonly used in anthropology research papers and journals. Here are the different reference formats in AAA style:

Author’s Last name, First name. Year of Publication. Book Title. Place of Publication: Publisher.

Example : Smith, John. 2019. The Anthropology of Food. New York: Routledge.

Author’s Last name, First name. Year of Publication. “Article Title.” Journal Title volume, no. issue: page range.

Example : Garcia, Carlos. 2021. “The Role of Ethics in Anthropology.” American Anthropologist 123, no. 2: 237-251.

Author’s Last name, First name. Year of Publication. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher.

Example: Lee, Mary. 2018. “Feminism in Anthropology.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press.

Author’s Last name, First name. Year of Publication. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. 2020. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed January 3, 2023).

Author’s Last name, First name. Year of Publication. “Title of Dissertation/Thesis.” PhD diss., University Name.

Example : Brown, Susan. 2022. “The Art of Storytelling in Anthropology.” PhD diss., University of California, Berkeley.

Author’s Last name, First name. Year of Publication. “Article Title.” Newspaper Title, Month Day.

Example : Robinson, Andrew. 2021. “New Developments in Anthropology Research.” The Guardian, September 15.

AIP (American Institute of Physics) Style

The American Institute of Physics (AIP) style is commonly used in physics research papers and journals. Here are the different reference formats in AIP style:

Example : Johnson, S. D. 2021. “Quantum Computing and Information.” Journal of Applied Physics 129, no. 4: 043102.

Example : Feynman, Richard. 2018. The Feynman Lectures on Physics. New York: Basic Books.

Example : Jones, David. 2020. “The Future of Quantum Computing.” In The Handbook of Physics, edited by John Smith, 125-136. Oxford: Oxford University Press.

Conference proceedings citation

Author’s Last name, First name. Year of Publication. “Title of Paper.” Proceedings of Conference Name, date and location: page range. Place of Publication: Publisher.

Example : Chen, Wei. 2019. “The Applications of Nanotechnology in Solar Cells.” Proceedings of the 8th International Conference on Nanotechnology, July 15-17, Tokyo, Japan: 224-229. New York: AIP Publishing.

Example : American Institute of Physics. 2022. “About AIP Publishing.” AIP Publishing. https://publishing.aip.org/about-aip-publishing/ (accessed January 3, 2023).

Patent citation

Author’s Last name, First name. Year of Publication. Patent Number.

Example : Smith, John. 2018. US Patent 9,873,644.

References Writing Guide

Here are some general guidelines for writing references:

• Follow the citation style guidelines: Different disciplines and journals may require different citation styles (e.g., APA, MLA, Chicago). It is important to follow the specific guidelines for the citation style required.
• Include all necessary information : Each citation should include enough information for readers to locate the source. For example, a journal article citation should include the author(s), title of the article, journal title, volume number, issue number, page numbers, and publication year.
• Use proper formatting: Citation styles typically have specific formatting requirements for different types of sources. Make sure to follow the proper formatting for each citation.
• Order citations alphabetically: If listing multiple sources, they should be listed alphabetically by the author’s last name.
• Be consistent: Use the same citation style throughout the entire paper or project.
• Check for accuracy: Double-check all citations to ensure accuracy, including correct spelling of author names and publication information.
• Use reputable sources: When selecting sources to cite, choose reputable and authoritative sources. Avoid sources that are biased or unreliable.
• Include all sources: Make sure to include all sources used in the research, including those that were not directly quoted but still informed the work.
• Use online tools : There are online tools available (e.g., citation generators) that can help with formatting and organizing references.

Purpose of References in Research

References in research serve several purposes:

• To give credit to the original authors or sources of information used in the research. It is important to acknowledge the work of others and avoid plagiarism.
• To provide evidence for the claims made in the research. References can support the arguments, hypotheses, or conclusions presented in the research by citing relevant studies, data, or theories.
• To allow readers to find and verify the sources used in the research. References provide the necessary information for readers to locate and access the sources cited in the research, which allows them to evaluate the quality and reliability of the information presented.
• To situate the research within the broader context of the field. References can show how the research builds on or contributes to the existing body of knowledge, and can help readers to identify gaps in the literature that the research seeks to address.

Importance of References in Research

References play an important role in research for several reasons:

• Credibility : By citing authoritative sources, references lend credibility to the research and its claims. They provide evidence that the research is based on a sound foundation of knowledge and has been carefully researched.
• Avoidance of Plagiarism : References help researchers avoid plagiarism by giving credit to the original authors or sources of information. This is important for ethical reasons and also to avoid legal repercussions.
• Reproducibility : References allow others to reproduce the research by providing detailed information on the sources used. This is important for verification of the research and for others to build on the work.
• Context : References provide context for the research by situating it within the broader body of knowledge in the field. They help researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : References provide a means for others to evaluate the research by allowing them to assess the quality and reliability of the sources used.

Advantages of References in Research

There are several advantages of including references in research:

• Acknowledgment of Sources: Including references gives credit to the authors or sources of information used in the research. This is important to acknowledge the original work and avoid plagiarism.
• Evidence and Support : References can provide evidence to support the arguments, hypotheses, or conclusions presented in the research. This can add credibility and strength to the research.
• Reproducibility : References provide the necessary information for others to reproduce the research. This is important for the verification of the research and for others to build on the work.
• Context : References can help to situate the research within the broader body of knowledge in the field. This helps researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : Including references allows others to evaluate the research by providing a means to assess the quality and reliability of the sources used.
• Ongoing Conversation: References allow researchers to engage in ongoing conversations and debates within their fields. They can show how the research builds on or contributes to the existing body of knowledge.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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How to create APA citations

APA Style is widely used by students, researchers, and professionals in the social and behavioral sciences. Scribbr’s free citation generator automatically generates accurate references and in-text citations.

This citation guide outlines the most important citation guidelines from the 7th edition APA Publication Manual (2020).

• Cite a webpage
• Cite a book
• Cite a journal article
• Cite a YouTube video

APA in-text citations

APA in-text citations include the author’s last name, publication date, and, if relevant, a locator such as a page number or timestamp. For example, (Smith, 2021, p. 170) . See it as a shorter version of the entry in the reference list .

You should include in-text citations every time you’re quoting or paraphrasing someone else’s ideas or words. In doing so, you give credit to the original author and avoid plagiarism .

Parenthetical vs. narrative citation

The in-text citation can take two forms: parenthetical and narrative. Both types are generated automatically when citing a source with Scribbr’s APA Citation Generator.

• Parenthetical citation: According to new research … (Smith, 2020) .
• Narrative citation: Smith (2020) notes that …

Multiple authors and corporate authors

The in-text citation changes slightly when a source has multiple authors or an organization as an author. Pay attention to punctuation and the use of the ampersand (&) symbol.

When the author, publication date or locator is unknown, take the steps outlined below.

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APA references

APA references generally include information about the author , publication date , title , and source . Depending on the type of source, you may have to include extra information that helps your reader locate the source.

It is not uncommon for certain information to be unknown or missing, especially with sources found online. In these cases, the reference is slightly adjusted.

Formatting the APA reference page

On the first line of the page, write the section label “References” (in bold and centered). On the second line, start listing your references in alphabetical order .

Apply these formatting guidelines to the APA reference page:

• Double spacing (within and between references)
• Hanging indent of ½ inch
• Legible font (e.g. Times New Roman 12 or Arial 11)
• Page number in the top right header

Which sources to include

On the reference page, you only include sources that you have cited in the text (with an in-text citation ). You should not include references to personal communications that your reader can’t access (e.g. emails, phone conversations or private online material).

In addition to the APA Citation Generator, Scribbr provides many more tools and resources that help millions of students and academics every month.

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References provide the information necessary for readers to identify and retrieve each work cited in the text .

Check each reference carefully against the original publication to ensure information is accurate and complete. Accurately prepared references help establish your credibility as a careful researcher and writer.

Consistency in reference formatting allows readers to focus on the content of your reference list, discerning both the types of works you consulted and the important reference elements (who, when, what, and where) with ease. When you present each reference in a consistent fashion, readers do not need to spend time determining how you organized the information. And when searching the literature yourself, you also save time and effort when reading reference lists in the works of others that are written in APA Style.

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Citing Sources: What are citations and why should I use them?

What is a citation.

Citations are a way of giving credit when certain material in your work came from another source. It also gives your readers the information necessary to find that source again-- it provides an important roadmap to your research process. Whenever you use sources such as books, journals or websites in your research, you must give credit to the original author by citing the source. 

Why do researchers cite?

Scholarship is a conversation  and scholars use citations not only to  give credit  to original creators and thinkers, but also to  add strength and authority  to their own work.  By citing their sources, scholars are  placing their work in a specific context  to show where they “fit” within the larger conversation.  Citations are also a great way to  leave a trail  intended to help others who may want to explore the conversation or use the sources in their own work.

In short, citations

(1) give credit

(2) add strength and authority to your work

(3) place your work in a specific context

(4) leave a trail for other scholars

"Good citations should reveal your sources, not conceal them. They should honeslty reflect the research you conducted." (Lipson 4)

Lipson, Charles. "Why Cite?"  Cite Right: A Quick Guide to Citation Styles--MLA, APA, Chicago, the Sciences, Professions, and More . Chicago: U of Chicago, 2006. Print.

What does a citation look like?

Different subject disciplines call for citation information to be written in very specific order, capitalization, and punctuation. There are therefore many different style formats. Three popular citation formats are MLA Style (for humanities articles) and APA or Chicago (for social sciences articles).

MLA style (print journal article):  

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles Vol. 49.3 (2003): 179-182.

APA style (print journal article):

Whisenant, W. A. (2003) How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX. Sex Roles , 49 (3), 179-182.

Chicago style (print journal article):

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles 49, no. 3 (2003): 179-182.

No matter which style you use, all citations require the same basic information:

• Author or Creator
• Container (e.g., Journal or magazine, website, edited book)
• Date of creation or publication
• Publisher 

You are most likely to have easy access to all of your citation information when you find it in the first place. Take note of this information up front, and it will be much easier to cite it effectively later.

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Research and Reference Services: Frequently Asked Questions

Back to Researchers Home

• What materials are in the Library of Congress collections?
• Where are the Library of Congress collections stored?
• How do I find out if the Library of Congress has the materials I need?
• Can I read the full text of books and journals listed in the Library of Congress online catalog?
• Does the Library of Congress have the full text of any of its collections available on the Internet?
• How can I read a book that is not available at my library but is listed in the collections of the Library of Congress?
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• Can I set aside materials to use over more than one day?
• Can I go into the stacks to browse or retrieve materials?
• Are there restrictions on what sort of items I can bring into the reading rooms?
• What online databases and indexes does the Library make available to researchers on site?
• Can I make photocopies of materials at the Library?
• Can I borrow materials from the Library?
• Does the Library provide computer facilities for word processing and other applications?
• Is there any place in the Library where I can get change for photocopying or telephones?
• How can I identify and locate publisher addresses for books and/or journals?
• How do I obtain information on an ISBN number or an ISSN number?
• Can the Library of Congress tell me how much my book is worth

The Library has in its collections well over 100 million items, in hundreds of different languages and virtually every format--not just books and journals, but also prints, drawings, government documents, photographs, microforms, films, sound and video recordings, manuscripts, and other formats. As large and diverse as the Library's collections are, it does not have every book ever published. While virtually all subject areas are represented in the collections, the Library does not attempt to collect comprehensively in the areas of clinical medicine and technical agriculture, which are covered by the National Library of Medicine and the National Agricultural Library , respectively. Researchers should also note that the Library of Congress is distinct from the National Archives , which is the major repository for the official records of the United States government.

Because of the extraordinary size and diversity of the Library's collections, there is no one place for researchers to access them. Most (but not all) of the Library's collections are located in the three main buildings of the Library--the Thomas Jefferson Building, James Madison Building, and John Adams Building--near the U.S. Capitol. (The collections of the National Library Service for the Blind and Print Disabled are housed elsewhere; consult their web page for more information.) Researchers coming to the Library can access materials in over 20 public reading rooms in the Jefferson, Adams, or Madison Buildings, depending on the format, subject, or language of the materials they are using. Most researchers use more than one reading room during their stay here. An annotated list of the Library's reading rooms is available on the Library of Congress website, as is the full text of Information for Researchers , a Library publication introducing prospective researchers to Library policies and services.

There is no one resource which lists all of the Library's holdings. Most of the Library's books, journals, and microforms from 1968 to the present are listed in the Library of Congress Online Catalog . The online catalog also has partial listings of some of the Library's non-book collections (e.g. manuscripts, sound recordings, sheet music), and partial listings of pre-1968 books, journals and microforms. Library of Congress materials are also listed in online bibliographic databases (e.g. OCLC), which are available at local libraries; consult your local librarians for more information on these services.

Not all of the Library's collections are listed in the online catalogs. The online catalog has only partial listings for non-book materials, and for books and monographs older than 1968. For older books, monographs, and serials, off-site researchers can consult the various editions of the National Union Catalog and the National Union List of Serials , which list the holdings of many U.S. research libraries including the Library of Congress. The National Union Catalog is available at many local libraries.

The Library's main card catalog, which lists book and journal holdings to the end of 1980, is located in the Main Reading Room of the Thomas Jefferson Building (LJ 100), and can only be searched on site. This is at present the most reliable source of information for books and journals older than 1968. Many of the Library's non-book materials are listed in catalogs available only in the appropriate Library of Congress reading room; consultation with reference staff in the reading room is necessary to locate materials. A list of the Library's reading rooms , with information about their collections and links to their web pages, is available on the Library of Congress website.

The files available through the online catalog provide bibliographic information only. The full text of books and journals is not available through the catalog. However, the Library does make available the full text of some materials via the Internet (see question "5" below).

The American Memory project to present digitized versions of American historical materials provides many examples of texts, photographs, sound recordings, and other materials from our collections. Many Library of Congress publications are available in full text online, such as the Handbook for Latin American Studies and Federal Research Division Country Studies/Area Handbooks . Some of the Library's exhibitions are also available on the Internet. Very occasionally, you may also find links in catalog records to the full text of resources which have been digitized by other institutions. However, these are only a small percentage of the Library's total holdings. Also, the Library provides full text of many bibliographies and guides to its collections.

Many of the items listed in the Library of Congress catalogs are available in other libraries. You can ask your local librarian about interlibrary loan service from participating libraries. Your library may be able to borrow a book from the Library of Congress provided it is not available at any other libraries.

Yes, the following provides guidance on our policy and ways to communicate with us. The Library of Congress encourages researchers to use local library resources first. Your local library will often be able to respond to your query more quickly than the Library of Congress, and is better able to identify and respond to your specific and ongoing needs. In most cases, you will find that the information you need is available at your local library. Once you have exhausted local and regional resources, you may seek the assistance of the Library of Congress by using our Ask A Librarian service . If you do not have Internet access, you may request the Library's assistance by writing correspondence to the following address:        Library of Congress        101 Independence Ave. SE        Washington, D.C. 20540

For security reasons, all U.S. Postal Service and private carrier mail is being screened off-site prior to arrival at the Library. This often causes delays in responding to print correspondence. For this reason, we recommend that researchers use the online Ask A Librarian service . The Library refers telephone reference questions to local libraries, which in most cases will have the resources to answer those questions. Researchers with questions regarding the Library's collections, services, and programs may call the Library of Congress operator at (202) 707-5000.

The Library of Congress maintains Congress.gov . The full text of bills is available for the 101st Congress, 1989-90, to the present, although bill status and summaries are available going back to the 93rd Congress (1973-74). (The full text of Congressional reports is also available from the 104th Congress, 1995-96, to the present).  For bills from previous Congresses and for government documents, reports prior to the 104th Congress, and Congressional hearings, visit a Federal Depository Library in your area. There is a database of Federal Depository Libraries , searchable by state or area code, available at the Government Printing Office website. Also, your local librarian can give you the location of the depository library in your Congressional district. There you can speak with a government documents librarian.

The Library is open to all researchers above high school age (16 years or older) possessing a valid photo identification (e.g. driver's license, passport) with a current address. However, the following policies and limitations apply to minors age 16 and above:

• The minor’s research project may not be part of a classroom assignment, i.e., a student may not be given an assignment that requires the use of Library of Congress reading rooms or Library collections. The Library’s web page is available to all for this purpose.
• Groups of minors touring the Library, or those visiting Washington, D.C. as part of other tours may not have access to Library reading rooms. Exhibition halls are open to all.
• Although a Reader Identification card will be issued to a minor working on a research project, it should be noted that the card does not permit patrons to access all materials in all Library reading rooms. Managers of individual reading rooms may have additional requirements to use their collections.

Students under the age of 16 who have a compelling research need to use the Library’s collections may petition the Associate Librarian for Library Services for admittance to Library reading rooms. In virtually all cases, high school projects can be completed using local libraries or interlibrary loan; the Library encourages high school students to use these resources in their research.

The Library has over 20 public reading rooms organized by subject, language, or format of material. Hours and policies vary for each. Each reading room has a web page with information on its hours, access policies, and its collections. You can view a consolidated list of reading room hours or listen to a recorded announcement of reading room hours at (202) 707-6400. You can also find out about the Library in published sources such as the American Library Directory (New York: R.R. Bowker, published annually). Such sources are widely available in local libraries.

The Library's three main buildings--the Thomas Jefferson Building, James Madison Building, and John Adams Building--are located on the 100 and 200 blocks of Independence Avenue SE in Washington D.C. Maps and floor plans for the Library of Congress are available online . Directions to the Library of Congress and information about public transportation options are available on the Library's Visitors Web site (because parking facilties near the Library are extremely limited, researchers are encouraged to use public transportation).

If after you have gotten your Reader Identification Card you are uncertain where to go to start your research, you may seek reference assistance in the Main Reading Room (Room 100 in the Jefferson Building). There are Research Guidance Volunteers in LM140 who can assist a researcher find his/her initial path to research his/her subject. Many first-time researchers are referred to the Main Reading Room to get oriented and plan their research in consultation with a reference librarian. You may be referred to another reading room, depending on the subject of your research, or the format or language of the materials you are using. In fact, many researchers need to visit reading rooms in all three of the Library's main buildings to complete their work.

The Humanities and Social Sciences Division of the Library offers a general research orientation to the Library on most (but not all) Monday mornings from 10:00 a.m. to 11:30 a.m., and on some Monday evenings from 6:30 to 8:00 p.m. The orientations are held in Room G07 of the Jefferson Building. A schedule and overview of the research orientation classes is available online. The schedule for research orientations can also be heard on a recorded message at (202) 707-4608. Advance registration is required for all classes; to register, call (202) 707-3370 between 8:30 a.m. and 5:00 p.m. ET Monday through Friday or register online .

Some Library of Congress reading rooms also offer research orientations or tours specific to their collections and services. Links to information about these sessions, including schedules and registration information appears at the bottom of the Classes for First-time Users page.

With a few exceptions, the Library's collections of books, journals, and other materials are in closed stacks, and must be retrieved.  Researchers may request materials using an online automated call system or may fill out paper call slips to request the materials they need. Most of the Library's general collection of books and journals is in the closed stacks of the Jefferson and Adams Buildings; specialized collections of books and other materials are in closed stacks in all three main Library buildings, or are stored off-site. Delivery times vary with the different reading rooms, ranging from a few minutes to the next business day. You should consult the various reading room home pages for more information on delivery of materials. If you are not certain where to request materials, consult a reference librarian. All of the reading rooms have reference collections on open shelves, where researchers may retrieve materials for themselves and use them in the reading room. However, these materials represent only a small fraction of the Library's holdings. In some cases, researchers may call ahead to have materials retrieved from the closed stacks before their arrival at the Library (e.g. if they are coming from outside the metropolitan Washington D.C. area, or if they have a large amount of material to be retrieved). More information on advance reserves is available online.

After materials are returned from use in the reading rooms, it takes up to one week before they are reshelved and ready for retrieval again. However, researchers may hold up to five books for seven days in the Reserve areas. Such areas are located in the Main Reading Room ; adjacent to the Book Service Desk on the fifth floor of the Adams Building; and in the Local History and Genealogy Reading Room . Each three-day reserve slip must be completed with the researcher's name and the date of the first day of reserve. Other reading rooms may allow researchers to reserve materials for future use. For more information, consult the appropriate reading room home page .

Access to the closed stacks is not permitted under any circumstances, except to authorized Library staff. Only the reading room reference collections are on open shelves.

All of the Library's reading rooms have some restrictions as to what items a researcher may bring with them as a means of enhancing the security of the collections used therein; the Personal Belongings Restrictions  web page provides general guidelines on personal property restrictions in all Library buildings as well information on slightly modified restrictions for the Adams building.  However, because specific policies differ for the various reading rooms, researchers should consult the various reading room home pages for more details. Cloakrooms are provided on the ground floor of the Jefferson Building (LJ G08 and adjacent to the Visitors' Center) and the first floor of the Madison Building (LM 140). Some reading rooms also provide lockers for researchers to secure their belongings.

The Library subscribes to a large number of online subscription databases which offer indexes to journals, information on library holdings, and other resources in a wide range of subject areas. Workstations for searching these services are available in all of the Library's reading rooms. The Library also subscribes to a number of Internet-based databases and full-text journal services, which are searchable on any of the public Internet workstations in the Library's reading rooms.  Patrons onsite using their personal laptops or other wireless-enabled devices to connect to the Library's wireless network are also able to access these services. The Library does not offer access to these services off-site, but they are widely available at public and academic libraries.

Some of the reading rooms have CD-ROM databases and other online subscription services, including titles served in the Microform and Machine Readable Collections Reading Room , full-text journals in the Newspaper and Current Periodical Reading Room , and Technical Report titles available through Science Reference Services.  Science Reading Room database titles are all listed on the appropriate reading room home page. Other reading rooms may have their own CD-ROM and other database resources; consult the appropriate reading room home page for more information. Please note that these resources are available only on site.

The Library's reading rooms have differing policies regarding the photocopying of materials. Some reading rooms restrict self-service photocopying on certain categories of material, based on preservation and security policies. It is best to consult staff in the appropriate reading room for specific information on its photocopying policy. Self-service debit card-operated copiers are available to serve researchers in most reading rooms. Prices vary depending on the material to be copied and the machine to be used. To purchase a debit card for copying, a one-dollar bill may be required on some machines; value can be added to these cards with any denomination up to $22. To add value with a credit card or corporate check, researchers must visit the Duplication Services counter Monday through Friday from 9:00 A.M. to 3:00 P.M.

The Library's Duplication Services can provide a wide range of reproductions of items from the Library's collections. The ability of the Library to furnish reproductions is subject to copyright law and certain other restrictions; however, every effort will be made to fulfill requests. Please provide specific citations (title, author, number of pages, and LC call number) for materials you wish copied. The Duplication Services is open 9:00 A.M. to 3:00 P.M. ET Monday through Friday. Further information about products, services, and prices can be obtained by contacting:        Duplication Services        Library of Congress, John Adams Building, Room LA-128        Washington, D.C. 20540-4917        Phone 202-707-5640 | Fax 202-707-1771 |   Web Contact Form

While researchers may bring laptop computers into the Main Reading Room and some of the other public reading rooms, the Library does not provide computing facilities for word processing and other software applications. Computer workstations in the public reading rooms are for catalog, database, and Internet searching only.

The Library of Congress does not sell books from its collections. See your local librarian or a book dealer in your area to find information on how to purchase books; or consult an online database with information on purchasing books, such as Bookfinder.com . The Library does photocopy materials from its collections within copyright guidelines; see above under question "20" for more information on photocopying materials . The Library's sales shop sells Library of Congress publications and other items.

Information about ISBNs may be obtained from the R.R. Bowker Company, 630 Central Avenue, New Providence, NJ 07974. Tel: 877-310-7333 Fax: 908-665-2895. Information about ISSN numbers may be obtained from the National Serials Data Program, Library of Congress, Washington, DC 20540-4160. The telephone number is 202-707-6452. Recorded information is available at this telephone number 24 hours a day.

The Library of Congress does not provide individuals with information on the current market value of books. Such a search would require extensive examination of published sources, and the results would not necessarily indicate the price that the item in your possession would bring in the market. Standard reference sources on book prices, available in most large libraries, contain records of auction sales and may list pertinent transactions. See a reference librarian at your local library for assistance.

Many used and rare book dealers often provide valuation of books. Internet book databases such as Bookfinder.com also provide price information for used or rare books. More information on rare books and book values can be found on the " Your Old Books " website, maintained by the Rare Books and Manuscripts Section of the Association of College and Research Libraries.

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