Patrick Carman Books

When she finds the key to a secret passageway leading out of the walled city of Bridewell, twelve-year-old Alexa realizes her lifelong wish to explore the mysterious forests and mountains that lie...

The tenth city

By Patrick Carman

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Alexa reveals the origin of the Land of Elyon while defending it against the evil Abaddon and his sinister forces, with not only the last Jocasta at stake but also the nature of the land itself.

The House Of Power

By Patrick Carman

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Skeleton Creek

By Carman Patrick

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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.