It's important to cite sources you used in your research for several reasons:
Sources: Citing sources: Overview and Scholarly Conversations and You
The MLA Style Center is the only authorized Web site on MLA style.
Turabian Citation Style, From the University of Chicago
Use a citation generator when you need to create a bibliography. These user-friendly, easy-to-use tools create individual citations that must be copied and pasted into a Word document. Be sure to proofread your citations for accuracy, completeness, and correct formatting. Although citation generators can be quite reliable, they are not error proof.
Zotero is also a robust citation manager. Billed as a "personal research assistant", it's a free, easy-to-use tool to help you collect, organize, cite, and share your research sources.
Citation Builder — automatically generates citations for print or online sources in MLA, APA, and Chicago
MLA, APA, Turabian, Chicago, etc. Some features require a free account. Upgrade for additional features.
Also works as a citation manager, and not just generator. Mendeley is a free reference manager for students and researchers. Make your own fully-searchable library in seconds, cite as you write, as well as read and annotate PDFs on any device.