A citation manager is a tool which helps you to store, organize and output your citations in the format you prefer.
Here is a summary - see guides for detail
Refworks (see guide)
Easy-to-use web-based product available to all Princeton users (www.refworks.com). RefWorks
allows you to import references from Princeton's Main Catalog and many
electronic databases to which Princeton subscribes. You can
conveniently compile a list of sources you intend to read--as you
identify them--and save the list online.
Endnote (see guide)
The leader among bibliographic managment applications. Robust, locally installed (rather than web-based) application which can handled the most complex of scenarios but has a steep learning curve. Software and updates can be purchased at a discount from OIT's Princeton Software Repository.