Jonathan Kellerman Books

Eccentric, reclusive Walter Rennert lies cold at the bottom of his stairs. At first glance the scene looks straightforward: a once-respected psychology professor, done in by booze and a bad heart....

Heartbreak Hotel

By Jonathan Kellerman

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Night moves

By Jonathan Kellerman

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While LAPD homicide detective Milo Sturgis investigates the murder of a John Doe in an upscale LA home, he calls on psychologist Alex Delaware to untangle the web of corrupted love, greed, and brok...

The Wedding Guest

By Jonathan Kellerman

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The museum of desire

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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.