Lisa Harkrader Books

The Twelve-Bug Day

By Lisa Harkrader Illustrated By Deborah Melmon

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Each read-aloud book in the Mouse Math series focuses on a single, basic math concept and features adorable mice, Albert and Wanda, who live in a People House. Entertaining fiction stories capture...

A Fishy Mystery

By Lisa Harkrader Illustrated By Cary PIllo

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Discover Math Matters! With over 15 million books sold worldwide, this award-winning series of easy-to-read books will help young readers ages 5–8 approach math with...

Librarians of the Galaxy (Book 11)

By Lisa Harkrader Illustrated By Jessica Warrick

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Acting like an Earthling isn’t easy! Follow the adventures of Spork the alien in the How to Be an Earthling series. Each book covers a different character trait to help kids think a...

Ruby Makes It Even!

By Lisa Harkrader Illustrated By M.H. Pilz

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Discover Math Matters! With over 15 million books sold worldwide, this award-winning series of easy-to-read books will help young readers ages 5–8 approach math with...

The Twelve-Bug Day

By Lisa Harkrader Illustrated By Deborah Melmon

Average: 0.00, 0 Ratings

Each read-aloud book in the Mouse Math series focuses on a single, basic math concept and features adorable mice, Albert and Wanda, who live in a People House. Entertaining fiction stories capture...

May the Votes Be With You (Book 7)

By Lisa Harkrader Illustrated By Jessica Warrick

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Acting like an Earthling isn’t easy! Follow the adventures of Spork the alien in the How to Be an Earthling series. Each book covers a different character trait to help kids think a...

No Place Like Space (Book 5)

By Lisa Harkrader Illustrated By Jessica Warrick

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Acting like an Earthling isn’t easy! Follow the adventures of Spork the alien in the How to Be an Earthling series. Each book covers a different character trait to help kids think about what...

Planet of the Eggs (Book 9)

By Lisa Harkrader Illustrated By Jessica Warrick

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Acting like an Earthling isn’t easy! Follow the adventures of Spork the alien in the How to Be an Earthling series. Each book covers a different character trait to help kids think a...

Rocket Rivals

By Lisa Harkrader Illustrated By Tammie Lyon

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Tying into the popular Makers Movement, Makers Make it Work is a series of fun easy-to-read stories that focus on problem-solving and hands-on action. With bright, eye-catching art and explanatory...

Snowball Run

By Lisa Harkrader Illustrated By Lynne Avril

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The Science Solves It! series merges fiction and science in storylines that intrigue kids and encourage them to observe, investigate, predict, and experiment! Young readers ages 5–8 will be i...

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.