If you plan to sell your books from the back of a lecture hall or the trunk of your car or a table on the sidewalk—or just want to give them away—you don’t need an ISBN. (International Standard Book Number).If you have an intention or dream of selling through bookstores either on Earth or online—you do need an ISBN. This comprehensive yet compact and easy-to-understand e-book explains what an ISBN is, how to get one, what it costs and how to use it. You'll also learn the pitfalls of free ISBNs, what books don't need them, and where you can get free ISBN barcodes.Bonus chapters cover choosing a business name and copyrights.Michael N. Marcus is a bestselling author and publisher of more than 30 books.