The APA (American Psychological Association) has developed standards for citing information resources used in papers and other projects and for writing clearly.
Publication Manual of the American Psychological Association: The Official Guide to APA Style. (2020). (7th ed.). Washington, DC: American Psychological Association
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The authoritative guide to the APA (American Psychological Association) reference and citation system most frequently used in scholarly psychology publications. In addition, the APA Manual offers guidance in developing effective headings, tables, figures, language, and tone for scholarly communication in psychology and other disciplines using the APA style.
APA Style Help http://www.apastyle.org/apa-style-help.aspx
Prepared by experts at the American Psychological Association, these Web pages provide guidance for writing a paper in APA style and for referencing information sources using the APA citation format. Consult the Frequently Asked Questions section for examples and explanations of commonly cited types of electronic and print resources. Also available is an online tutorial about the basics of APA style.
APA Formatting and Style Guide (OWL Materials, Purdue University)
This online resource, revised to conform to the Publication Manual of the American Psychological Association (2019, 7th ed.), provides additional interpretations and examples to help you apply the APA style. Written by J.M. Paiz, E. Angeli, & others, this guide is part of Purdue University's OWL (Online Writing Lab) series. Since the APA citation guidelines change, be sure to check the sources developed by the American Psychological Association itself to be sure you are using the most recent, authoritative guidelines. (See the two APA sources cited above.)
Information about the MLA (Modern Language Association) citation style and writing guidelines may be found in:
MLA Handbook for Writers of Research Papers (2009, 7th ed.)
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MLA Formatting and Style Guide (Online Writing Lab, Purdue University)
The Purdue University Online Writing Lab provides instructions for using Modern Language Association Style and citation guidelines.
See also the MLA Citation Style LibGuide.