Horrmann Library has created a Citation Styles guide to provide links to websites, sample papers, and other materials in order to cite properly in MLA, APA, or Chicago Style.
Zotero http://www.zotero.org/
Zotero is a free tool that allows you to gather and organize research sources from online catalogs, web sites, and journal databases. Sources can be organized into folders, and links, tags, and searchable notes can be added. Zotero also works in conjunction with Microsoft Word, to allow easy insertion of parenthetical citations and the creation of bibliographies in APA, MLA, and Chicago styles.
ZoteroBib http://zbib.org
ZoteroBib s a free and easy way to create bibliographies made by the creators of Zotero. It can create bibliographies in 9,000 different styles that you can copy and paste into your paper. Unlike the full version of Zotero, there is no need to download any software to your computer. It can be a good option if you just need to quickly create a bibliography.