Geoff Johns Books

Avengers Standoff

By Geoff Johns, Dan Jurgens, Mike Grell

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The Avengers

By Geoff Johns

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With all of the world's capitals, including Washington, D.C., disappearing into a myterious void, the Avengers are called upon to stem the growing panic and chaos and govern the world.

War of the Green Lanterns. Writers Geoff Johns Peter J. Tomasi

By Geoff Johns

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JLA JSA

By David S. Goyer, Carlos Pacheco, Geoff Johns

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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.