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  1. ISBN - Wikipedia

  2. What Is an ISBN and How to Get It? Your Definitive Guide to ISBN

  3. International Standard Book Number | ISBN, Identification, …

  4. What is an ISBN? | International ISBN Agency

  5. About the ISBN standard | ISBN.org

  6. FAQs: General Questions | ISBN.org

  7. ISBN and ISSN Systems: General Information and Resources

  8. ISBN Definition & Meaning - Merriam-Webster

  9. ISBN Definition & Meaning | Dictionary.com

  10. ISBN | English meaning - Cambridge Dictionary