Cathy Hapka Books

Ice Age 2: A Mammoth Mix-Up

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As the Ice Age comes to an end, animals Manny, Sid, Diego and their friends scramble to escape an oncoming flood. During the journey, they are joined by Ellie, a mammoth who thinks she is an opposum.

Fantastic Four: The Photo Novel

By Seidman David, David Seidman

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Charlotte's Web: New in the Barn

By Cathy Hapka

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Fern raises Wilbur as a baby pig. Soon he grows too big to stay with her and must move into the barn at her uncle's farm next door.

Charlotte's Web: The Perfect Word

By Cathy Hapka

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Templeton helps Charlotte to save Wilbur by finding words for her to put in her web.

Ice Age: Diego's Journey: An Early Chapter Book

By Cathy Hapka

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Time Warp Trio

By Cathy Hapka, Jon Scieszka

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Time Warp Trio

By Cathy Hapka, Jon Scieszka

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Time Warp Trio: The High and the Flighty

By Lisa Rao, Cathy Hapka, Jon Scieszka

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Time Warp Trio

By Lisa Rao, Cathy Hapka, Jon Scieszka

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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.