The following sources will help you with using the APA (American Psychological Association) format for citing sources:   

• Overview of APA, http://www.lib.utk.edu/~training/Module/APAIO.html -
• APA Style.org, APAStyle.org - A Product of the American Psychological Association. "The following is excerpted from the new 5th edition of the Publication Manual. The material provided covers commonly asked questions regarding how to cite electronic media." (Not the entire APA manual!)
• Using American Psychological Association (APA) Format, http://owl.english.purdue.edu/handouts/research/r_apa.html -  Information on this page is taken from The Publication Manual of the American Psychological Association (5th edition). (Not the entire APA manual!).
• IN PRINT : Publication Manual of the American Psychological Association . Hodges Reference Desk: BF76.7 .P83 2001