Whenever you use sources such as books, journals, or Web sites in your research papers you must give credit to the original author by properly citing the sources. Citations also help your reader find the sources again. There are a number of different online citation management tools, citation styles, depending on the discipline in which you are working and help from librarians on citation formatting. The following links provide guidelines to using a variety of citation styles.
Citation Style Guides:
APA Style Quick Citation Guide (Social Sciences)
CSE Style Quick Citation Guide (Sciences)
MLA Style Quick Citation Guide (Humanities)
Chicago Style Quick Citation Guide (History)
Free Online Citation Generators:
Citation Creation is a free to use online citation tool to create and format MLA, APA and Chicago styles easily, with helpful examples.
Citeme gives you the flexibility to work and allows you to create your bibliography, footnotes, endnotes and in-line citations.
Citeulike is a free service for managing and discovering scholarly references
Citation Machine is also one of the best web citation tool.
Easybib: is new citation guide! Currently the reference guide only covers MLA citations.
EndNote Export transfers references from a Web-based resource directly into EndNote.
Mendeley : is a highly versatile citation management system aimed at academic researchers
NoodleBib Express, Individual citations in MLA or APA format.
Ottobib books only entering the ISBN provides instant citations in MLA, APA, and Chicago/Turabian styles
Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources.