John Christmas Books

Sheltered

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The men and women of Safe Haven have been preparing for any and all end-of-world scenarios for years. However, their bunkers, weapons, and training can't save them from the one threat they never co...

Barack the Barbarian

By Larry Hama, John Christmas, Chris Schons, Josh Blaylock

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KGB Banker

By John Christmas, William Burton McCormick

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Sheltered

By John Christmas, Ed Brisson

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Inishbofin

By John Christmas

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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.