DO I NEED A DIFFERENT ISBN FOR EACH EDITION OF MY BOOK?
With all of the new publishing formats available, what's the rule with ISBNs and ebooks, apps, audio guides, etc. Do you need a new ISBN for each format? For instance, if I have a print version of my book available on Amazon, do I need to buy a new ISBN for an ebook that I might create to sell through Amazon, too? …

