Cathy Hapka Books

Kung Fu Panda - Movie Storybook

By Cathy Hapka

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Stuart Little 2: The Joke Book

By Cathy Hapka

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Mucha Lucha!: The Fortune Donut

By Cathy Hapka

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Mucha Lucha!: Big Bad Flea

By Cathy Hapka

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"The Flea has been transferred to bad-guy class. Can Rikochet, Buena Girl, and Snow Pea rescue their friend before the Flea starts to enjoy destruction, mayhem, and cheating?"

Astro Boy Color and Sticker Book Astro Boy

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.