Laurie Calkhoven Books

DK Life Stories: Martin Luther King Jr.

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In this kids' biography, discover the amazing story of Martin Luther King Jr., whose powerful words and dreams for the future inspired the world.Martin Luther King Jr. will always be remembered for...

DK Life Stories

By Laurie Calkhoven

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Duke Kahanamoku

By Laurie Calkhoven

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Meet Duke Kahanamoku, three-time Olympic gold medalist and the father of modern surfing.

Misty Copeland

By Monique Dong, Laurie Calkhoven

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Misty Copeland

By Laurie Calkhoven

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Pirouette across the stage and get to know Misty Copeland the first African-American woman to become a principal ballerina with the American Ballet Theater.

The women who launched the computer age

By Laurie Calkhoven

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In 1946, six brilliant young women programmed the first all-electronic, programmable computer, the ENIAC, part of a secret World War II project. They learned to program without any programming lang...

Secret agents Sharks Ghost armies

By Laurie Calkhoven

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The Secrets of American History is a new, nonfiction Level 3 Ready-to-Read series that takes beginning readers on a tour of the action, adventure, and intrigue that helped form and protect the coun...

Mae Jemison

By Monique Dong, Laurie Calkhoven

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Project friendship

By Laurie Calkhoven

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"You can't wait for the science fair. You have so many fun ideas! But working with friends sure gets complicated. One partner disagrees with your ideas. Another leans on you a little too much. Can...

You Can t Bring a Sandwich to the Moon . . . and Other Stories about Space

By Laurie Calkhoven

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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.