When writing a paper with lots of citations, there are several tools that can help.
EndNote is now available campuswide, free for MSU students, faculty, & staff as of Summer 2014 thanks to a library subscription. Login with your NetID to dowload the correct installer:
EndNote, bibliographic management and formatting software, can help you manage citations, PDFs, and in text references throughout the process of writing a research paper.
Various versions of EndNote are available. See which have which features by using their compare tool.
EndNote Basic (formerly EndNote Web)
EndNote X7 for Windows has been released as of May 2013. Also, EndNote Web has been renamed EndNote Basic and is not free for all users. Those like MSU students, faculty, and staff who have access to the library's Web of Science subscription get expanded coverage in EndNote Basic.
New in EndNote X7 (and see comparison with older versions):