A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Online and other electronic books
Notes-bibliography style: citing specific types of sources
Part II. Source Citation

For online books, follow the guidelines for print books. In addition to the usual elements, include the URL and the date you accessed the material (see 15.4.1, 17.1.7). Note that a URL alone is not sufficient; you must provide the full facts of publication, as far as they can be determined, so that a reader can search for the source even if the URL changes. If page numbers are not available, you may identify the location of a cited passage in a note by adding a descriptive locator (such as a preceding subheading) following the word under before the URL and access date.

N: 1. Julian Samora and Patricia Vandel Simon, A History of the Mexican-American People, rev. ed. (East Lansing, MI: Julian Samora Research Institute, Michigan State University, 2000), under “Civil War in Mexico,” http://www.jsri.msu.edu/museum/pubs/MexAmHist/chapter14.html#six (accessed December 19, 2005).

B: Samora, Julian, and Patricia Vandel Simon. A History of the Mexican-American People. Rev. ed. East Lansing, MI: Julian Samora Research Institute, Michigan State University, 2000. http://www.jsri.msu.edu/museum/pubs/MexAmHist/chapter14.html#six (accessed December 19, 2005).

When you cite books published in other electronic formats, such as those available for download or other delivery from a bookseller or library, identify the format (CD-ROM, Microsoft Reader e-book).

N: 1. Thomas H. Davenport and John C. Beck, The Attention Economy: Understanding the New Currency of Business (Cambridge, MA: Harvard Business School Press, 2001), TK3 Reader e-book.

B: Hellman, Hal. Great Feuds in Technology: Ten of the Liveliest Disputes Ever. New York: John Wiley, 2004. Rocket e-book.