Check with your instructor about which to use. Collect the needed information while viewing sources.
APA Style Manual explanation from Purdue University
Basic Legal Citation explanation from Cornell University
CSE (Council of Science Editors) explanation from Diane Hacker Handbook (source no longer available)
Chicago Style (also known as Turabian) explanation from University of Wisconsin
MLA Formatting & Style Guide explanation from Purdue University
Citing Government Documents using MLA explanation from University of Nevada
EasyBib.com free bibliographic citing help for MLA, APA, Chicago/Turabian
When style manuals refer to an aggregate OR an aggragated database, this refers to databases that have articles from more than one publication.