Charles Darling's Guide to Grammar and Writing (Capitol Community College) http://grammar.ccc.commnet.edu/grammar/

Literacy Education Online (LEO) (St Cloud State University) http://leo.stcloudstate.edu/

Purdue Online Writing Lab (OWL) (Purdue University) http://owl.english.purdue.edu/

English Works! On-Line Grammar Tutorials (Gallaudet University) http://aaweb.gallaudet.edu/CLAST/Tutorial_and_Instructional_Programs/English_Works/Grammar.html

University of Illinois, "Bibliography Styles Handbook-MLA Format" http://www.cws.illinois.edu/workshop/writers/citation/mla/

University of Illinois, "Bibliography Styles Handbook-APA Format" 
http://www.cws.illinois.edu/workshop/writers/citation/apa/

University of Wisconsin, Writer's Handbook. Documentation:Chicago Style 
http://writing.wisc.edu/Handbook/DocChicago.html

University of Wisconsin, Writer's Handbook. "Documentation:CBE"  
http://writing.wisc.edu/Handbook/DocCBE.html

Bedford-St. Martin's Press, "Diana Hacker's Research and Documentation Online-MLA Style"  http://dianahacker.com/resdoc/p04_c08_o.html

Bedford-St. Martin's Press, "Diana Hacker's Research and Documentation Online-APA Style "  http://dianahacker.com/resdoc/p04_c09_o.html

Bedford-St. Martin's Press, "Diana Hacker's Research and Documentation Online-Chicago Style "  http://dianahacker.com/resdoc/p04_c10_s1.html

Bedford-St. Martin's Press, "Diana Hacker's Research and Documentation Online-CBE Style "  http://dianahacker.com/resdoc/p04_c11_o.html