What are ISBN numbers?
ISBN stands for International Standard Book Number and these numbers are unique identifiers for titles.

Why are there two ISBNs for this product?
A few years ago, we were required to switch from 10-digit ISBNs to 13-digit ISBNs. We include both so that customers who previously used a 10-digit ISBN can easily find the correct product.

Which ISBN should I use to order this product?
You may use either ISBN when ordering. You may also use the 3-digit item number.

Please note: not all of our products require ISBNs. If there is no ISBN listed for a product, please use the item number to order that product.

If you have any questions, please call 1-800-940-2270. We'd be happy to assist you!