From the Chicago Manual of Style online
Quote:
Book published electronically
If a book is available in more than one format, you should cite the version you consulted, but you may also list the other formats, as in the second example below. If an access date is required by your publisher or discipline, include it parenthetically at the end of the citation, as in the first example below.
N:
2. Philip B. Kurland and Ralph Lerner, eds., The Founders’ Constitution (Chicago: University of Chicago Press, 1987), http://press-pubs.uchicago.edu/founders/ (accessed June 27, 2006).
B:
Kurland, Philip B., and Ralph Lerner, eds. The Founders’ Constitution. Chicago: University of Chicago Press, 1987. http://press-pubs.uchicago.edu/founders/. Also available in print form and as a CD-ROM.
T:
(Kurland and Lerner 1987)
R:
Kurland, Philip B., and Ralph Lerner, eds. 1987. The founders’ Constitution. Chicago: University of Chicago Press. http://press-pubs.uchicago.edu/founders/.
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