An ISBN, or International Standard Book Number, is a unique 10 or 13 digit number that publishers assign to a specific edition of a title. They are found at the barcode printed on each book (usually on the back cover, sometimes on the inside jacket).

ISBNs are how we identify titles and connect editions to their title data verified by our in-house experts. When you scan or manually enter an ISBN into your Booksource Classroom library, the system will match it in our database to its unique title data to give you the best information on your library.

NOTE: Book club publishers such as Scholastic have their own unique assigned ISBN barcodes. These ISBN barcodes will not register in the Booksource Classroom system. These types of books may be entered into the library manually. For instructions click here.