For an overview of several different styles, you could consult: Cite Right: A Quick Guide to Citation Styles--MLA, APA, Chicago, the Sciences, Professions and More. PN171.F56 L55 2011 -- there are several print editions in the Library, and another available via Netlibrary.
MLA Style Manual and Guide to Scholarly Publishing, 3rd Ed.
REF PN147.G444 2008, 1 copy at the Reference Desk
Publication Manual of the American Psychological Association, 6th Ed
REF BF76.7.P83 2010, 1 copy at the Reference Desk, 1 copy at the Reserve Desk