Citation Managers are bibliographic management programs that will help you keep track of articles and books as you find them, organize your references and create bibliographies in 100s of citation styles (e.g., APA, MLA, Chicago, Turabian, etc.)
They will also allow you to:
The most popular citation managers are EndNote and Zotero.
EndNote - Web version (EndNote Online or EndNote Basic) free to anyone; integrates with MS Word; the Instruction Labs at the Oviatt Library have the Cite-While-You-Write plug-in on Word for students to access their EndNote web accounts
Zotero - Free to anyone; integrates with MS Word and/or Google Docs; must be installed on your own computer