Zotero
Zoterois a citation manager. You can export citations directly from many databases and library catalogs directly into your own personal database, then have Zotero create a selective bibliography in exactly the style you choose. The software is open source and is available to anyone without cost or an institutional affiliation.
Citing Sources
Quick examples of MLA, APA, Turabian, and Chicago styles for the most commonly cited materials; indispensable resource if you're not using Zotero.