What if I can’t find the ISBN number?

If you purchased your book from us and you can’t find your book’s ISBN number, you may need to use the “MBS Book Number” to sell back your book. For books that don’t have ISBNs, we put a small sticker on the back of the book with the BNC Book Number. The BNC Book Number is 11 characters, both beginning and ending with a letter. The BNC Book Number is printed beneath the barcode on every BNC label.

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