Download Zotero and associated plug-ins using these links:
Zotero is a free, open source, easy-to-use Firefox add-on (and now works with Chrome and Safari) that helps you to collect, manage, cite, and share your research sources. It lives right where you do your work - in your web browser. Designed to be intuitive and unobtrusive (it looks a lot like an iTunes library), Zotero is a powerful and handy tool for any academic.
Zotero works on all three major operating systems: PC, Mac, and Linux.
Zotero Quick Start Guide: The A, B, C's of "Z"
Zotero is a production of the Roy Rosenzweig Center for History and New Media at George Mason University and is funded by the United States Institute of Museum and Library Services, the Andrew W. Mellon Foundation, and the Alfred P. Sloan Foundation.
Quickly download the Zotero Firefox Add-on: