Michelle Knudsen Books

Revenge of the Evil Librarian

By Michelle Knudsen

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The Princess of Trelian

By Michelle Knudsen

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Part of Michelle Knudsen’s exciting fantasy trilogy — in a luminous paperback editionMeg will soon be named the princess-heir of Trelian, but her connection to her dragon, Jakl, is maki...

The Mage of Trelian

By Michelle Knudsen

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Part of Michelle Knudsen’s exciting fantasy trilogy — in a luminous paperback editionCalen is desperate to escape Krelig, the evil mage, but he knows he must first learn as much as he c...

Revenge of the Evil Librarian

By Michelle Knudsen

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The stage is set for a fiendishly dramatic summer at theater camp for Cynthia and her boyfriend, Ryan. With no demons at all. Right?Last fall, Cynthia Rothschild saved her best friend, as well as t...

Library Lion

By Michelle Knudsen

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Slimy Story Science Solves It

By Michelle Knudsen

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Carl the Complainer Social Studies Connects

By Michelle Knudsen

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Dinosaur Days Road to Writing Mile 2 Creative Writing with Help

By Michelle Knudsen

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The Case of Vampire Vivian

By Amy Wummer, Michelle Knudsen

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Moldy Mystery

By Michelle Knudsen

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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.