What product identifiers are:
The product identifier for books is the ISBN (International Standard Book Number). Every title published in North America after 2007 must have an ISBN-13 that identifies it as a unique book product available to be bought and sold.
There are also several other identifiers—including EAN, UPC, GTIN, ISNI, and ISTC—that are of interest to the Canadian book supply chain.
BookNet Canada provides education and information on how different product identifiers are used in the book supply chain.
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