The menu lets you choose the formatting of references on this site (for your convenient copy-paste pleasure).
APA formatting is done in accordance with the APA Publication Manual:(2001): Publication Manual of the American Psychological Association. American Psychological Association (APA)
MLA formatting is done in accordance with the MLA Style Manual:Gibaldi, Joseph and Lindenberger, Herbert (1998): MLA Style Manual and Guide to Scholarly Publishing (2d ed). Modern Language Association of America