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The International Standard Book Number (ISBN) is a unique numeric commercial book identifier that is either 10 or 13 digit in length.

10 votes
1 answer
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What is the formula for converting a 10 digit ISBN to a 13 digit ISBN?

I didn't see this question here yet so I thought I would ask if someone has the formula for converting a 10 digit ISBN to a 13 digit ISBN and vice-versa. …
DᴀʀᴛʜVᴀᴅᴇʀ's user avatar
6 votes
Accepted

Publishing e-book

Sometimes a publisher provides an ISBN because they buy it in bulk. Having an ISBN is suggested to help identify your book and you can go to Bowker to obtain one. … to, and it's optional: If you go through Apple, my understanding you are not required to provide an ISBN if the title is FREE. …
DᴀʀᴛʜVᴀᴅᴇʀ's user avatar