Getting an ISBN for Your E-Book
Consider obtaining an International Standard Book Number, or ISBN, for your e-book. Every edition of a print book has one of these unique identifying numbers. (For example, a hardback title has one ISBN, and its paperback version has another.) As a self-publishing author, you can either buy your own ISBN, by registering as a publisher with your country’s ISBN agency, or use a free ISBN provided by Smashwords. If you prefer to buy your own ISBN, remember to allow time for it to be issued. (Ask your country’s issuing agency for a delivery estimate.)
Purchasing your own ISBN
An ISBN for your e-book isn’t a necessity, though some sites (including Apple, Kobo, and Sony) don’t accept e-books without ISBNs.
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You can add an ISBN after publishing your e-book on Smashwords (as described later in this chapter), so you don’t need to decide now. After you’ve assigned an ISBN to an e-book, you can never transfer it to another book. Neither can you change it after Smashwords has sent it to retailers.
If you’re planning to publish multiple e-books, you may want to register as a publisher and purchase your own set of ISBNs. (Purchasing ten ISBNs is usually more economical than purchasing only one, and some countries require you to purchase at least ten.) ISBN pricing ...