ISBNs must be purchased from the official agency in the country where your publishing business is physically located.
Nielsen Book Services handles registration.
Thorpe-Bowker serves these regions.
Buying International Standard Book Number (ISBN) blocks is a strategic move for authors and publishers who plan to release multiple book formats or future titles. Because every distinct format of a book—such as paperback, hardcover, and audiobook—requires its own unique ISBN, purchasing in bulk significantly reduces the cost per unit.
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