Cathy Hapka Books

Flip s Great Escape
Heart of a Dolphin
Heart of a Dolphin

By Cathy Hapka

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Endangered Species
Endangered Species

By Cathy Hapka

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Secret Identity
Secret Identity

By Cathy Hapka

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Disney East High Story Collection
The floating palace
The floating palace

By Cathy Hapka

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During her family vacation on a floating palace, Sofia befriends a mermaid, and through their friendship helps save the mermaid's kingdom.

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Sofia the First
Sofia the First

By Grace Lee, Cathy Hapka

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Walls of Babylon
Walls of Babylon

By Cathy Hapka

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The city of Nasaf is no longer safe for Dastan, so he takes a messenger job in Babylon to make money and get out of the way of the White Huns.

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Westward bound
Westward bound

By Cathy Hapka

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Wild hearts
Wild hearts

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.

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