The ISBN (International Standard Book Number):

An ISBN is a 13-digit number that uniquely identifies books and book-like products.

 Each number identifies a unique edition of a publication, from one specific publisher, allowing for more efficient marketing of products by booksellers, libraries, universities, wholesalers and distributors.

Website:https://www.myidentifiers.com.au/isbn/about

All University of Tasmania publications are required to have an ISBN on the final published version