Cathy Hapka Books

The enchanted feast

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When an evil fairy disguises herself as a powerful sorceress to take over a Tri-Kingdom Area feast, Sofia forms an unlikely team with Clover, Cedric and Wormwood to protect her family and amulet.

Princesses to the rescue

By Cathy Hapka

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Sofia, Amber, Princess Jun, and a visitor embark on a daring rescue mission when James and Prince Jin become trapped while searching for the legendary treasure of the Jade Jaguar.

Friends 4 ever

By Cathy Hapka

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When a student named Ashley enrolls at East High, Gabriella offers to show her around. But Gabriella soon begins to wonder if Ashley is using her to get closer to Sharpay and Troy.

Changing Tides National Treasure

By Cathy Hapka

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Midnight Ride National Treasure

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.