John Cassidy Books

The Book of Kids Songs

By Nancy Cassidy, John Cassidy

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The Unbelievable Bubble Book

By John Cassidy, David Stein

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The Klutz Yo Yo Book

By John Cassidy, Cassidy John.

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The official Koosh book

By John Cassidy

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The Official Koosh Book is a complete collection of Kooshy activities including Koosh Squoosh, Cutn'Run, Nose Bonk, Bop the Brother, and 29 others.

The Unbelievable Bubble Book Eddie Bauer Special Edition

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The Adventures of the Koosh Kins

By John Cassidy

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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.