Zotero is a free, open-source citation management tool. If you're having trouble keeping track of or properly formatting your references (or if you're just wanting an assist that can help save you some time), try it out. You can also use Zotero to share resources with group project members and annotate those resources as a group.
As a member of the Princeton University Community, you can have access to unlimited storage in Zotero if you authenticate with a current Princeton email address.
If you'd like to learn more about Zotero, check out this resource guide.
Register for a Zotero training workshop at this link.