Roy Johansen Books

Silent Thunder

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Marine architect Hannah Bryson was hired to inspect a decommissioned Soviet submarine, Silent Thunder, that was recently purchased by the U.S. government for use as a maritime museum. Before she an...

Storm Cycle

By Iris Johansen

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Shadow Zone

By Iris Johansen

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A discovery by submersible designer Hannah Bryson suggests a possible cause of mythical Atlantis's mysterious demise that has potentially cataclysmic consequences for the modern world.

Shadow Zone

By Iris Johansen, Roy Johansen

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The answer man

By Roy Johansen

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Beyond Belief

By Roy Johansen

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Deadly Visions

By Roy Johansen

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A killer crosses over…Ace magician turned ace police detective Joe Bailey, a.k.a. the Spirit Basher, needs all his expertise when he’s teamed up with psychic investigator Monica Gaines to crack a s...

Beyond belief

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Deadly visions

By Roy Johansen

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Close Your Eyes

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.