RefWorks--an online management, writing and collaboration tool -- is designed to help researchers easily gather, manage, store and share all types of information, as well as generate citations and bibliographies. RefWorks is a web-based bibliography and database manager that allows you to create your own personal database by importing references from text files or online databases and from various sources. You can use these references in writing papers and automatically format the paper and the bibliography in seconds. If you do not already have an account you can set one up here: http://library.hunter.cuny.edu/citation-tools
Write-N-Cite is a Microsoft Word (Windows and Mac) plug-in designed to help you automatically format citations. It can work online and off line. Unfortunately it does not work with pages or open office. You can read more about the software here:http://www.refworks-cos.com/refworks/Write-n-Cite/
If you cannot use Refworks or are interested in using a different tool, check out Hunter College Libraries page of Citation Management Tools.