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We just need the ISBN: What's this?

The ISBN is often located on the back of the book, next to the barcode. It is also sometimes found on the inside book sleeve. It will commonly be labeled "ISBN" or "ISBN 13". Both are valid ISBNs that refer to the same book. See this example: If you haven't got the book to hand, you can get the ISBN by searching for the book on Amazon.
You don't need to worry about the dashes, but make sure you include all the numbers
Book ISBN:	Example