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An ISBN is a key tool for selling your book online. The ISBN is a unique identifier for your book and some online book stores will not sell a book without it. Most self-publishing companies offer ISBNs when you publish through them. It is important to establish whether the ISBN belongs to them or to you. You can also obtain your own ISBNs, which might be useful if you intend to publish more than one book. ISBNs are sold in blocks through offices in different countries. You can visit the ISBN website to find out where you can get them.