Citation management software allows you to organize your citations by topic, class, or project and then quickly create a bibliography or cite a source within your paper.
EndNoteOrganize, manage, and cite your references online. The Basic/Online version is free to students, faculty, and staff. The desktop version must be purchased but may be available at no cost through your institution of higher education.
RefWorks Organize, manage, and cite your references online. This resource must be purchased but may be available at no cost through your institution of higher education.
Mendeley Free reference manager and academic social network. Make your own fully-searchable library in seconds, cite as you write, and read and annotate your PDFs on any device.
ZoteroA free product that can help you manage and format your citations. It is a Firefox plug-in. Download the plug-in and start uploading citations.