Jennifer Castle Books

The Aristokittens 3: The Fantastic Rabbit Race

By Jennifer Castle

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The Aristokittens 1: Welcome to the Creature Cafe

By Jennifer Castle

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The Aristokittens 2: The Great Biscuit BakeOff

By Jennifer Castle

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When We Had Summer

By Jennifer Castle

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The Sisterhood of the Traveling Pants meets 13 Little Blue Envelopes in this new young adult novel about a tight-knit, daring, and eclectic group of friends who dedicate every summer to completing...

When We Had Summer

By Jennifer Castle

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The Aristokittens 4: The Terrific Talent Show

By Jennifer Castle

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Disney magic meets adorable kittens in this illustrated chapter book series that stars Marie, Berlioz, and Toulouse from The Aristocats on a new adventure--running their own creature café!Af...

Aristokittens 4

By Jennifer Castle

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American Girl

By Jennifer Castle

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American Girl

By Jennifer Castle

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Friends and Frenemies

By Jennifer Castle, Kaela Graham, Deborah Reber

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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.