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“EAN codes ordinarily have the first three digits (the prefix) identifying the country of manufacture, but that doesn't make sense for books. The industry committee's clever solution was to invent two new imaginary countries -- called Bookland 1 and Bookland 2 -- with corresponding prefixes of 978 and 979." (29)”
― Bruce T. Batchelor, Book Marketing DeMystified: Enjoy Discovering the Optimal Way to Sell Your Self-Published Book, Practical advice from the inventor of print-on-demand (POD) publishing

“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.”
― David Wogahn, My Publishing Imprint: How to Create a Self-Publishing Book Imprint & ISBN Essentials