Roy Johansen Books

The naked eye

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"How can you catch a killer when everyone thinks he's dead? Kendra Michaels was instrumental in bringing serial killer Eric Colby to justice. And yet, despite his apparent execution at San Quentin,...

Shadow Zone

By Iris Johansen, Roy Johansen

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Look Behind You A Novel Kendra Michaels

By Iris Johansen, Roy Johansen

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Double blind

By Iris Johansen

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"The #1 New York Times bestselling and Edgar Award winning authors are back with an electrifying new novel that will leave your heart racing. Kendra Michaels is reluctant to help the FBI with the m...

Double Blind

By Iris Johansen, Roy Johansen

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The Naked Eye

By Iris Johansen, Roy Johansen

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Silent Thunder

By Jennifer Van Dyck, Iris Johansen, Roy Johansen

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Silent Thunder

By Iris Johansen, Roy Johansen, Jennifer VanDyck

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Silent Thunder

By Jennifer Van Dyck, Iris Johansen, Roy Johansen

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Silent Thunder

By Iris Johansen, Roy Johansen, Jennifer VanDyck

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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.