Basic Legal Citation — Cornell Law School
http://www.law.cornell.edu/citation/

Brief Guide to Citing Government Publications — The University of Memphis
http://exlibris.memphis.edu/resource/unclesam/citeweb.html

Citing Your Sources — The Libraries of the Claremont Colleges
http://libraries.claremont.edu/help/res_help/citing.asp

Grammars and Language Courses — yourDictionary.com
http://www.yourdictionary.com/grammars.html

Style Wizard
http://www.stylewizard.com/