Duffy Chris Comic Book Writer Books

SpongeBob comics

By Duffy Chris Comic Book Writer, Stephen Hillenburg

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Collects the humorous adventures of Spongebob Squarepants and his fellow citizens of Bikini Bottom. Die-Cut.

Fairy tale comics

By Duffy Chris Comic Book Writer

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From favorites like "Puss in Boots" and "Goldilocks" to obscure gems like "The Boy Who Drew Cats," this volume has something to offer every reader. Seventeen fairy tales are wonderfully adapted and...

Fable comics

By Duffy Chris Comic Book Writer

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"Amazing cartoonists take on classic fables from Aesop and beyond!"--Cover.

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.