If the purpose of your book is to earn an income, you will need an ISBN. An ISBN serves as a unique code that identifies your book in the industry. If you plan to have different formats of your book, i.e. paperback, hardcover and even an E-book, each version of your book will require its own ISBN. Books that are intended for retail distribution are according to the Legal Deposit Act of 1997, authors are required to submit one copy of their book to the legal depository to be entered into the library system. This applies to E-books as well. We assist with this process and an administration fee is charged for requesting the ISBN.