NAME Business::ISBN - work with International Standard Book Numbers SYNOPSIS use Business::ISBN; # 10 digit ISBNs $isbn10 = Business::ISBN->new('1565922573'); $isbn10 = Business::ISBN->new('1-56592-257-3'); # 13 digit ISBNs $isbn13 = Business::ISBN->new('978-0-596-52724-2'); # convert $isbn10 = $isbn13->as_isbn10; # for the 978 prefixes $isbn13 = $isbn10->as_isbn13; # maybe you don't care what it