Jonathan Kellerman Books

Savage Spawn

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This thought-provoking and timely book from a #1 New York Times bestselling novelist and noted child psychologist reveals the factors that often lead to explosive and shocking juvenile violence.“Et...

Billy Straight

By Jonathan Kellerman

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Dr. Death

By Jonathan Kellerman

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Dr. Death

By Jonathan Kellerman

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The Murder Book

By Jonathan Kellerman

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When Los Angeles psychologist and sleuth Alex Delaware becomes embroiled in a long-unsolved case of brutal murder, he finds his own life and that of his longtime friend, homicide detective Milo Stu...

A Cold Heart: An Alex Delaware Novel

By Jonathan Kellerman

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A Cold Heart

By Jonathan Kellerman

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The Conspiracy Club

By Jonathan Kellerman

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Devastated and suspected by the police after the brutal murder of his girlfriend, psychologist Jeremy Carrier finds himself engaged in a game of cat and mouse when additional murders take place and...

The Conspiracy Club

By Jonathan Kellerman

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Therapy

By Jonathan Kellerman

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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.