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The standard citation style guide book for the fields of business, education, health science, public service, and social scienceis the Publication Manual of the American Psychological Association, 6th edition, 2010. The American Psychological Association (APA) publishes the manual. Commonly referred to as "the APA Manual".
E-books come in a variety of formats (e.g., Kindle, Adobe Digital Editions, EPub, HTML, and more) and can be read on a variety of devices (e.g., e-readers like the Kindle, Nook, and Sony Reader, as well as on personal computers and mobile devices through online portals such as NetLibrary, ebrary, and Google Books). This post shows how to cite any e-book in APA Style.