With older scanners, the ISBN printed on the book cover may only scan as a 10-digit number.

ISBNs are now all encoded as 13-digit numbers (Starting 978...) and it is better to use the 13 digit version as this is now the industry standard.

You can reconfigure your scanner to scan the ISBN as a 13-digit number. 

Simply download the attached document, print it out and scan the barcodes in order from top to bottom.