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. (2010). (6th ed., 2nd printing). Washington, DC: American Psychological Association.
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The authoritative guide to the APA (American Psychological Association) bibliographic citation style most frequently used in scholarly psychology publications. In addition, the Manual presents the explicit requirements of the APA writing/editorial style (including guidelines for punctuation, spelling, capitalization, headings, tables, and figures), guidelines for avoiding sexist language and plagiarism, and the content and organization of a manuscript.
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 (Online Writing Lab, Purdue University)
This online resource, revised to conform to the Publication Manual of the American Psychological Association (2010, 6th ed., 2nd printing), 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.