Some e-books have a DOI (digital object identifier). Include the DOI in the citation when available.
Electronic Version of Print Book
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Shotton, M. A. (1989). Computer addiction? A study of computer dependency [Kindle DX version]. Retrieved from http://www.ebookstore.tandf.co.uk/html/index.asp OR Schiraldi, G. R. (2001). The post-traumatic stress disorder sourcebook: A guide to healing, recovery, and growth [Adobe Digital Editions version]. doi:10.1036/0071393722
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Electronic-Only Book
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O'Keefe, E. (n.d.). Egoism & the crisis in Western values. Retrieved from http://www.onlineoriginals.com /showitem.asp?itemID=135
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