Zotero is a free, open source browser app that collects, manages, cites, and shares your research sources. There is a browser extension that saves info and connects with the desktop Zotero (you need both desktop and browser extension). Additional info at:
Libguides.willamette.edu/zotero
For Zotero help contact:
Bill Kelm, bkelm@willamette.edu or
John Repplinger, jrepplin@willamette.edu
Chicago Manual of Style Online
"Completely searchable and easy to use, The Chicago Manual of Style Online provides recommendations on editorial style and publishing practices for the digital age."
Different disciplines use different citation styles and your professors are allowing you to choose the style you are most familiar with. The library has created a handy guide that lists many of the available style guides: