E-book edition ISBNs

I’m a little confused about ebook editions and updating. So, one thing that seems like I should be doing is when I bring out a new ebook (like Feast of Serendib), I should include links at the back to my other ebooks (like Vegan Serendib, the Marshmallows of Serendib, Perennial, etc.). That’s straightforward enough.

BUT. It seems like I should also upload new versions of those earlier books with links to the new ebook, yes? And my question is, does that ‘count’ as a new edition, in the eyes of librarians, booksellers, and academics? Do I need to change the ISBN? That seems sort of goofy, since I’m essentially just changing advertising copy, not the actual text of the original book.

Is there settled practice on this? Or are we just in a Wild West of chaotic ISBN-assigning? (Yes, I know a lot of ebook writers don’t even bother with ISBNs, but that makes the librarian and academic in me cringe — I couldn’t do that myself.)

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