“An ISBN is assigned to each specific format of a book and never reused. Like golf, the rules are made-up and simple, but can be misinterpreted or applied incorrectly.” Publishing BooksPublishing ProcessIsbnPublishing MistakesPublishing Advice Book:My Publishing Imprint: How to Create a Self-Publishing Book Imprint & ISBN Essentials Source: My Publishing Imprint: How to Create a Self-Publishing Book Imprint & ISBN Essentials