Jeff Johnson Books

Designing user interfaces for an aging population

By Jeff Johnson

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Everything Under the Moon

By Jeff Johnson

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Born in Missouri more than a century ago and raised in a Pentecostal orphanage, the creature now calling himself Gelson Verber has changed his name countless times. He’s part-werewolf, and ma...

Everything Under the Moon

By Jeff Johnson

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Born in Missouri more than a century ago and raised in a Pentecostal orphanage, the creature now calling himself Gelson Verber has changed his name countless times. He’s part-werewolf, and ma...

Draw Fight Scenes Like a Pro

By Jeff Johnson, Johnson Jeff

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Tattoo Machine - 6-copy pre-pack with L-card

By Jeff Johnson

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Ultimate Electric Pressure Cooker Cookbook

By Jeff Johnson

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Everything I'm Not Made Me Everything I Am

By Jeff Johnson

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Award-winning activist journalist and motivational speaker Jeff Johnson dares the post-Civil Rights generation to stop making excuses, overcome personal challenges, and create lives...

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.