John P. Koster Books

Reading, writing & parents who care

By John P. Koster

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The atheist syndrome

By John P. Koster

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Operation Snow

By John P. Koster

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Recently declassified evidence and never-before-translated documents tell the real story of the day that FDR memorably declared would live in infamy, exploring how Joseph Stalin and the KGB used a...

Custer Survivor The End Of A Myth The Beginning Of A Legend

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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.