Zotero is a free citation management system, originally developed by George Mason University. Use it to collect, organize, annotate, and cite sources in whatever citation style you need: APA, MLA, Chicago, NLA, and AMA, as well as journal-specific styles. (Over 8,000 styles are available.) Zotero has a steep learning curve, so be prepared to spend time with it as you begin, but it can be so helpful. Bottom line: Zotero is a huge time-saver and a great organizational tool for your research.
Getting Started With Zotero video tutorial (about 4 minutes) from Loyola Marymount University library on downloading and installing Zotero.
Why Use Zotero? Watch this brief (2-minute) Cite Faster: Use Zotero video tutorial to get a good idea!
This Using Zotero video tutorial (about 15 minutes) from UNC Park Library provides information on