John Costanza Books

Simpsons Comics Confidential

By John Costanza, Matt Groening, Chuck Dixon

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The Simpsons are once again in the global spotlight due to many misadventures including Bart and Lisa, who, while corresponding with their pen pals, cause an international incident.

Simpsons comics

By Terry Delegeane

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Lost in the fun house

By Jack C. Harris, Jack Harris

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Ronald McDonald and the tale of the talking plant

By John Albano

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Ronald and the Grimace go insearch of a talking plant to find out why it wouldn't help two children find their way out of the forest.

Bugs & The Pink Flamingo (Golden Friendly Books)

By Gina Ingoglia, Golden Books

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The undauntable Bugs Bunny solves all his friends' gardening problems.

Bugs Bunny Buried Treasure Picture Parade Storybook Series

By Walt Disney

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Ms. Pac Man's Prize Pupil MS Pac Man

By John Albano

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Computer in the Candy Store (Scooter Computer)

By Leslie McGuire

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Scooter uses his computer to estimate the financial costs of building a club house.

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.