Write-N-Cite is a utility from RefWorks that can help you format citations and bibliographies in research papers.
You can install Write-N-Cite on Windows or Mac OS.
When you run Write-N-Cite for the first time, you may see a warning from your firewall software that advises you to block the program. Do not take that advice -- make sure you allow the program to access the Internet!
If you're using Write-N-Cite from off-campus, you will need to use the WNC Proxy Configuration utility. In Windows, go to Start Menu -> Programs -> Refworks -> WNC Proxy Configuration utility.
To learn more about RefWorks, consult their excellent tutorial.