Christopher Kelly Books

Rousseau as author

By Christopher Kelly

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Attila the Hun

By Christopher Kelly

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Italy invades

By Christopher Kelly

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Offers a global tour of Italian military history, arranged by country, from the Roman Legionnaires to George Custer's 7th Cavalry at the Battle of Little Big Horn to modern Italian Eurofighter Typh...

America invades

By Christopher Kelly

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"America has invaded 43% of the countries in the world, and it has been militarily involved with nearly all the rest. This book offers a global tour of America's military activity, arranged by coun...

Pray for Me

By Christopher Kelly

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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.