Katrina Ostrander Books

The Jewel of Yavin

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Great Clans of Rokugan Legend of the Five Rings

By Katrina Ostrander, Robert Denton III, Mari Murdock, Daniel Lovat Clark

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Great Clans of Rokugan Legend of the Five Rings

By Katrina Ostrander, Robert Denton III, Mari Murdock, Daniel Lovat Clark

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Investigators of Arkham Horror

By Katrina Ostrander

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The Investigators of Arkham Horror

By Katrina Ostrander

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An essential tome for all the most daring fans of Arkham Horror, Eldritch Horror, Elder Sign, Mansions of Madness, and the other Arkham Horror Files games, The Investigators of Arkham Horror contai...

Worlds of Android

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The world changed. People did not. Discover the technologies, events, and corporations that shaped the rich universe of Android and Android: Netrunner in The Worlds of Android, your definitive guid...

Alchemist and the Archer

By Katrina Ostrander

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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.