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  1. ISBN - Wikipedia

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

  3. How to Understand an ISBN Code - wikiHow

  4. FAQs: General Questions | ISBN.org

  5. About the ISBN standard | ISBN.org

  6. What is an ISBN? | International ISBN Agency

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

  8. ISBN and ISSN Systems: General Information and Resources

  9. ISBN Definition & Meaning - Merriam-Webster

  10. What Is An ISBN? | Book Riot