For complete guidelines on the APA Style, consult:

Reference Desk: BF76.7 .P83 2001
Publication Manual of the American Psychological Association. Washington, DC: The Association, 2001.

Or consult the APA Style Guide to Electronic References [PDF] online.

Sample APA Citations:

Book:

Smith, P.V. (2006). Understanding social psychology across cultures: Living and working in a changing world. London: SAGE.

Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Periodical, volume number(issue number), pages.

Kitayama, S., Markus, H.R. (2000). Culture, emotion, and well-being: Good feelings in Japan and the United States. Cognition and Emotion. Vol 14(1), 93-124.

Online Source:

Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of online periodical, volume number(issue number if available). Retrieved month day, year, from http://www.someaddress.com/full/url/

Gewold, J. (2001). Insulin activity in the brain. The Harvard Brain, Vol 8. Retrieved 8/29/2006, from http://hcs.harvard.edu/~husn/BRAIN/vol8-spring2001/insulin.htm.