What is an ISBN?

An ISBN is a 10- or 13-digit number that uniquely identifies published books worldwide. ISBN stands for International Standard Book Number. You do NOT need an ISBN to sell your NOOK Book through NOOK Press. If you don't have an ISBN, just click "No" beneath "Do you have an eBook-specific ISBN?" on the Title & Description page.

Note: NOOK will always assign a unique identifier, known as the BN ID, to your NOOK Book when it is put On Sale as a NOOK Book. This is not an ISBN. It is NOOK's own internal number for use in the NOOK system. This number is displayed here for your reference. It will also be displayed as the "BN ID" in the Product Details section of your NOOK Book's customer product page.