Begin the entry in the works-cited list like the entry for a comparable printed work and end it with a designation of the medium of publication. The medium is the type of electronic file, such as Kindle file, Nook file, EPUB file, or PDF file. If you cannot identify the file type, use Digital file.
Rowley, Hazel. Franklin and Eleanor: An Extraordinary Marriage. New York: Farrar, 2010. Kindle file.