The APA suggests two instances in which footnotes may be used:
It is recommended to refrain from extensive usage of footnotes as this practice may distract or confuse readers. When applicable, incorporate additional information in the main text of the paper, but avoid inserting irrelevant material. Footnotes should briefly present the reader with meaningful information that enhances your argument.
Footnotes may be displayed in one of two ways:
If the footnotes are compiled on a separate page, the title “Footnotes” should be centered at the top of the page. Avoid formatting the title with bold, italics, underlining, or quotation marks. Indent the first line of each footnote five spaces from the left margin, and double-space the entire page. Each footnote number should be formatted as a superscript, and should be situated after all punctuation marks excluding a long dash (—).
1A new dietary ingredient is defined as dietary ingredients that were not marketed in the United States in a dietary supplement prior to October 15, 1994.
3Supplementary data are available on the journal Web site (http://apnm.nrc.ca) or may be purchased from the Depository of Unpublished Data, Document Delivery, CISTI, National Research Council Canada, Building M-55, 1200 Montreal Road, Ottawa, ON K1A 0R6, Canada. DUD 5396. For more information on obtaining material refer to http://cisti-icist.nrc-cnrc.gc.ca/eng/ibp/cisti/collection/unpublished-data.html.
2From the chapters “Motive-Based Trust and Decision Acceptance” and “Societal Orientations: Legitimacy and Connections With Society” in Trust in the Law: Encouraging Public Cooperation With the Police and Courts, by Tom R. Tyler and Yuen J. Huo, 2002, New York: Russell Sage Foundation. Copyright 2002 by the Russell Sage Foundation, 112 East 64th Street, New York, NY 10021. Reprinted with permission.
 Dodge, T., & Kaufman, A. (2007). What makes consumers think dietary supplements are safe and effective? The role of disclaimers and FDA approval. Health Psychology, 26(4), 513-517. doi:10.1037/0278-6188.8.131.523
 Gramlich, L. M., Olstad, D., Nasser, R., Goonewardene, L., Raman, M., Innis, S., & ... Roy, C. (2010). Medical students’ perceptions of nutrition education in Canadian universities. Applied Physiology, Nutrition & Metabolism, 35(3), 336-343. doi:10.1139/H10-016
 De Cremer, D., & Tyler, T. R. (2007). The effects of trust in authority and procedural fairness on cooperation. Journal of Applied Psychology, 92(3), 639-649. doi:10.1037/0021-9010.92.3.639
*Sponsored by the University of South Florida, this page is used in conjunction with USF's online tool for reviewing and assessing documents, My Reviewers, http://myreviewers.com.
Writing Commons, http://writingcommons.org, the open-education home for writers, is a peer-reviewed, award-winning, academic resource. Most pages are pubished under a CC BY-NC-ND 3.0 license, but a few are published under a CC BY-NC-SA 3.0 license; the Common Comments pages are copyrighted by USF, University of South Florida, but used with permission. See particular pages to determine copyright.