The Associated Press Stylebook and Briefing on Media Law, usually called the AP Stylebook, is the primary style and usage guide for most newspapers and newsmagazines in the United States. The stylebook is edited by longtime AP editor Norm Goldstein, and it is updated annually, usually in June. The 2006 edition is a little over 400 pages long.

APA style
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Chicago Manual of Style
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• AP Stylebook
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    AP also offers a subscription-based online version of the stylebook, which is updated with style changes as they are made and supports the addition of local style entries.