The inclusion of an International Standard Book Number in your book design, places you in the “Books in Print” reference series, available in print and online from many different places. Additionally, this places the book in the database that most large chain bookstores and many smaller book shops use to special order titles. This is a way to get Barnes & Noble and Books-A-Million to carry the book without loosing inventory control. If an author has their own ISBN, they fill these orders directly. Generally, if a publisher ISBN is used, a copy or two stays with the publisher to fill these orders.