
Though I can’t claim that I have had success with all of these, they ARE free and will get you in the ballpark of citation accuracy! Check with your profs’ requirements, however. What is said on the syllabus is the gospel!
Name/URL: Son of Citation Machine / http://citationmachine.net/
Formats: MLA, APA, Turabian, Chicago
Name/URL: Noodle Tools / http://www.noodletools.com/
Formats: MLA, APA
Name/URL: Easy Bib / http://www.easybib.com/
Formats: MLA, APA
Name/URL: Bib Me / http://www.bibme.org/
Formats: MLA, APA, Chicago, Turabian
Name/URL: Zotero (Firefox Extension) / http://www.zotero.org/
Formats: MLA, APA, Chicago
Name/URL: Otto Bib / http://ottobib.com/
Formats: MLA, APA, Chicago/Turabian, BibTeX, Wikipedia
Name/URL: Knight Cite / http://www.calvin.edu/library/knightcite/
Formats: MLA, APA, Chicago
Name/URL: Internet Citation Maker /
http://www.interaction-design.org/citation-maker/
Formats: APA, MLA, BibTex, Refer
Name/URL: Source Aid / http://www.sourceaid.com/
Formats: MLA, APA, Chicago, CSE