Citation Formatting and Management Tools
Tools for Formatting Citations
Citation Machine
http://citationmachine.net/

Tools for Formatting & Managing Citations  
Mendeley
http://www.mendeley.com
Mendeley is a very user-friendly, non-browser dependent, citation management tool, compatible with both Macs and PCs. Mendeley is a desktop-based program but data can be backed up to the cloud; Mendeley can also be downloaded to multiple devices and data can be synced.

Zotero
http://www.zotero.com/
This is a Firefox browser-based system for bibliographic management; however, there are now Chrome and Safari extensions that expand Zotero's usability. Also, Zotero is now cloud-based, enabling you to access your Zotero account from multiple devices. Zotero allows you to drag and drop documents right into your Zotero library.

Need help deciding which citation management program to choose?
See:
http://www.mendeley.com/videos-tutorials/
http://www.zotero.org/support/screencast_tutorials

Need basic steps for using Mendeley?
Step-by-step Guide: Installing Mendeley
Step-by-step Guide: Using Mendeley

Need help and examples of how to cite your sources?
Check out:
Citing Your Sources Help Guide