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With these tools you can collect book and article citations from the library catalog and databases. Then using a plugin for MS Word, you can insert those citations into your paper in the appropriate format.
Zotero is a free, open source citation management tool that comes as a Firefox extension or a standalone program for other browsers. It offers plugins for MS Word and Open Office so you can insert citations as you write your paper.
Mendeley is not only a citation manager, it is also a social network for scholars. Download the free desktop app that works on any platform. It has plugins for MS Word and Open Office. Mendeley offers a mobile app too.