Roy Johansen Books

Storm Cycle

By Roy Johansen, Iris Johansen

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Close Your Eyes

By Roy Johansen, Iris Johansen

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Look Behind You

By Roy Johansen, Iris Johansen

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Sight Unseen

By Iris Johansen, Roy Johansen

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Sight unseen

By Iris Johansen

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"She was safe in a world of darkness. Now danger threatens in the cold light of day...Before the experimental surgery that gave her sight, Kendra Michaels developed her other senses to an amazing c...

Sight Unseen

By Iris Johansen, Roy Johansen

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The naked eye

By Iris Johansen

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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,...

Night watch

By Iris Johansen

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"Born blind, Kendra Michaels spent the first twenty years of her life living in the darkness. Then, thanks to a revolutionary medical procedure developed by England's Night Watch Project, she was g...

Night Watch

By Iris Johansen, Roy Johansen

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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.