The Chicago Manual of Style by 
Publication Manual of the American Psychological Association by Citation builders are programs that can help you create your citation. In most cases, you simply type in the information the program asks for (author name, title, etc.) and hit the submit button. The program will create a citation for you that you can copy and paste into your document.
Mendeley
http://www.mendeley.com/
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http://www.zotero.org/
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BibMe
http://www.bibme.org/
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Citation Builder
http://www.lib.ncsu.edu/citationbuilder
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Citation Machine
http://citationmachine.net/
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Citavi Free - Windows 7 or Windows Vista OS only
http://www.citavi.com
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EasyBib
http://www.easybib.com
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KnightCite Citation Service
http://www.calvin.edu/library/knightcite/
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NoodleBib Express
http://www.noodletools.com/login.php
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