Quote:
Originally Posted by Notjohn
(So if I used ISBNs, I could use the same one everywhere? That's nice to know, for future-proofing.)
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An ISBN should refer to a specific version of a book. So yes, the same ISBN could (and should) be used for an ePub edition sold in different bookstores, but you should (although many authors don't) use different ISBNs for ePub and Kindle editions of the same book.