What does this book come with? It has 2 isbn codes? Does that mean that its two items?

http://search.barnesandnoble.com/booksea鈥?/a>





see the above link|||ISBN-13 is the new format. They will replace ISBN numbers. It is just one item.|||The title just outside the order box information says "REV" which usually means "revised". Clicking on the book cover icon, reveals that this is the "ninth edition", however the little blurb about the book towards the bottom of the page refers to the "seventh edition". Also information on this page indicates that this is a hardcover book. SO: the 2 different ISBNs could refer to: 1) a ninth edition and a revised ninth edition, 2) the ninth edition and the seventh edition, 3) a hardcover and a paperback edition.