Use the same format for both print books and e-books. Include a Digital Object Identifier (DOI), when it is available.
Basic Format:
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Author, A. A., Author, B. B., & Author, C. C. (Year). Title of book: Subtitle words. Publisher Name.
Example:
Basic Format for E-Book from a Library Database (such as Ebook Central and O'Reilly's Online)
Example: