> ISBN, by the way, will tell you the format of the book. Paperback and hardcover books have separate ISBNs. To add, ISBNs will also tell you the cover of the

> ISBN, by the way, will tell you the format of the book. Paperback and hardcover books have separate ISBNs. To add, ISBNs will also tell you the cover of the book. If you have 5 hardcover editions where each has a separate cover image, that's 5 ISBNs. The ISBN corresponds to a specific format of a book, always. Only reprints share an ISBN. And ISBNs also tell you a lot about the book.