Trudy Harris Books

Tally Cat Keeps Track

By Trudy Harris, Andrew N. Harris

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20 Hungry Piggies

By Trudy Harris, Andrew N. Harris

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Clock Struck One

By Trudy Harris, Carrie Hartman

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Jenny Found a Penny

By Trudy Harris, John Hovell

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Splitting the Herd

By Trudy Harris, Russell Julian

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Perico is a Spanish-speaking parrot who lives in a pet store, and although he works very hard to earn a new home, buyers keep returning him until the bird, now bilingual, finds the perfect owner. I...

Pattern Fish

By Trudy Harris, Anne Canavari Green

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The Clock Struck One

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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.