Quote:
Originally Posted by queentess
I know that Amazon requires an ISBN if you want to tie an ebook to the paper version of the same book.
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Not even then, Queentess. The key requirement there (to have the linking happen automatically) is simply that the author, title and series information match exactly. But even if they don't, you can still email KDP support and they'll link the versions up for you. No ISBNs required.