Cathy Hapka Books

"Macy Misa is the biggest JONAS fan out there. She also happens to go to school with bandmates Kevin, Joe, and Nick Lucas, and she's best friends with Stella, the band's stylist. When Macy overhear...

The search for Cyra

By Cathy Hapka

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The chronicles of young Dastan

By Cathy Hapka

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A boy living in a trash heap in Nasaf, the throne of the Persian Empire is adopted and becomes a prince. He learns a legend of a flame that grants its wielder power over men and is forced to strugg...

Winnie the Pooh: Pooh's Secret Garden

By Disney Books

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Pooh just discovered that the secret to a fine garden is busy bees. And the secret to hive full of honey is a fine garden! Being a very hungry bear, he decides to plant a garden of his own. Will Po...

Charlotte's Web

By Catherine Hapka

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Shrek the third

By Cathy Hapka

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Shrek and Donkey search far and wide to find a king for Far Far Away so that Shrek and Fiona can go home to their beloved swamp.

Shrek the third

By Cathy Hapka

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Shrek and Donkey find Fiona's cousin Artie to bring him back to Far Far Away to be king, but Artie doesn't think he can be king--and neither does Prince Charming, who wants the job for himself.

Friends 4ever

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.