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CMOS Style for E-books
The Chicago Manual of Style (CMOS) requires e-books to be formatted with the type of e-book at the end, like this:
Bibliography
Turabian, Kate L. A Manual for Writers of Research Papers, Theses, and Dissertations: Chicago Style for Students and Researchers. 9th ed. University of Chicago Press, 2018. Kindle.
Reference
Kate L. Turabian, A Manual for Writers of Research Papers, Theses, and Dissertations: Chicago Style for Students and Researchers, 9th ed. (University of Chicago Press, 2018), Kindle.
I experimented with this and put "Kindle" into the URL field. When pulling the citation information into Microsoft Word through the Zotero plug-in, it created the perfect format. If you instead try to do the Quick Copy directly from Zotero and paste the output, it will convert the word "Kindle" into a hyperlink. It's quick and easy to break the link.
There are a couple of other ways to add your ebook format into your citation--ways that are not CMOS-perfect, but would probably pass muster in most cases. You can add "Kindle" in the edition field or you can put "medium: Kindle" in the Extra field, which will place the word after anything you've typed into the edition field.
