John Katzenbach Books

Day of Reckoning

By John Katzenbach

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Just Cause

By John Katzenbach

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The Shadow Man

By John Katzenbach

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Shadow Man

By John Katzenbach

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State of Mind: A Novel of Suspense

By John Katzenbach

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Jeffrey Clayton, a professor of abnormal psychology, believes that his father had committed suicide after killing a student more than twenty years ago, but when odd messages appear and a murder tak...

Hart's war

By John Katzenbach

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Hart's War

By John Katzenbach

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Second Lieutenant Tommy Hart, a navigator whose B-25 was shot out of the sky in 1942, is burdened with guilt as the only surviving member of his crew. Now he is just another POW at the fiercely gua...

The Analyst

By John Katzenbach

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The Analyst

By John Katzenbach

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Happy fifty third birthday, Doctor. Welcome to the first day of your death. Dr. Frederick Starks, a New York psychoanalyst, has just received a mysterious, threatening letter. Now he finds himself...

The Madman's Tale: A Novel

By John Katzenbach

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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.