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What's an ISBN?

Every book has a International Standard Book Number.
This number is either:

10 digits long, known as an ISBN10
(may end with an "x")


13 digits long, known as an ISBN13
(must begin with 978 or 979)

Where do I find my book's ISBN?

ISBN's are almost always found in two places on a textbook: (1) Inside the front cover or first couple pages and (2) On the back cover of the book, usually above a barcode.

IMPORTANT: Campus Bookstore Customers

If you purchased your textbook at the campus bookstore, there may be a sticker on the back of the book, covering the correct ISBN with a campus bookstore barcode.

Either peel off this sticker, or find the ISBN inside the back of the book.


An ISBN10, highlighted above.