Ryan Herndon Books

Powerpuff Girls PowerPuff Girls

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The city of Townsville...has been transformed into a winter wonderland! Join the Powerpuff girls and all their friends as they celebrate Christmas, superhero-style.

Guinness World Records

By Ryan Herndon, Laurie Calkhoven

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Guinness world records

By Ryan Herndon, Dina Anastasio

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For 50 years, Guinness World Records has been collecting cool facts about the world's most amazing record-breakers. In this collection, we focus on the animal and plant kindoms. From the friendlies...

Codename Kids Next Door Operation S.W.E.E.T.S. KND Codename Kids Next Door Codename Kids Next Door

By Ryan Herndon

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Guinness World Records

By Ryan Herndon

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3 D extreme

By Ryan Herndon

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See Guinness World Record-breakers in an all-new, extreme way: 3-D!

Guinness world records

By Celeste Lee

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Guinness world records.

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.