Cathy Hapka Books

How Not to Start Third Grade

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Nothing can ruin a new school year...except maybe a pesky little brother. This Step 4 reader is the perfect back-to-school story for newly independent readers! Will should be excited to start t...

How Not to Babysit Your Brother

By Ellen Titlebaum, Cathy Hapka

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How not to start third grade

By Cathy Hapka

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The first day of school becomes chaotic when third-grader Will's younger brother, Steve, arrives for kindergarten.

Horse Diaries 11: Jingle Bells (Horse Diaries Special Edition)

By Cathy Hapka

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A heartwarming Clydesdale chapter book for the holiday season! For all lovers of horses, history, and the holidays, here’s a very special Horse Diaries book. Wisconsin, 1915. Jingle Bells is a s...

Jingle bells

By Cathy Hapka

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For all lovers of horses, history, and the holidays, here's a very special Horse Diaries book. Wisconsin, 1915. Jingle Bells is a strong Clydesdale gelding. He enjoys his work on the farm, pulling...

The Lost Lunch Money (Clue School:Level 4-Second Grade and Up)

By Cathy Hapka

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Bubbles and the opposite potion

By Cathy Hapka

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"In the time before time, a great being watched over the ancient land of Mata Nui, protecting it from harm. But now a powerful evil has arisen, casting a dark shadow over the land. Just when all se...

Beware the Bohrok

By C. A. Hapka, Cathy Hapka

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"After a long and difficult journey, the Toa have finally embraced their destiny. Despite their differences, they have joined together as a mighty force for good. But will their combined powers b...

Bionicle

By Cathy Hapka

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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.