Zotero

Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources. It lives right where you do your work—in the web browser itself.
I suggest you use this great extension to manage your research references and produce your bibliography in Harvard format. Click on the image and watch the video demonstration. Start now before you get too far into your research!