The following are the three most frequently used Citation Management Tools. It is a personal preference which one you choose.
RefWorksis a Web-based citation manager that allows you to import references from text files, web sites or online databases. You can use RefWorks to format a paper and a bibliography in seconds. Checkout the RefWorks Research Guide for more information
The new RefWorks is a premier reference management service that supports the needs of students, faculty and librarians. With a refined user experience, full-text management, collaboration and other features you’d expect from a reference management solution, RefWorks enables students and faculty to have a more efficient and reliable process for producing the best research papers and grants. Libraries are able to offer this powerful service and have full administrative controls and analytic's that provide a consistent source of patron and content usage.
Manage References Cite and Generate Bibliographies Organize Your Papers
Word and Libre Office plugins
Mendeley is free online reference citation management tool that allows you to manage, organize, write, cite and collaborate with folks locally and internationally. As a web-based tool, you can sync desktop and web searching.