Jon Lellenberg Books

Arthur Conan Doyle: A Life in Letters

By Arthur Conan Doyle

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Arthur Conan Doyle: A Life in Letters

By Doyle A. Conan

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Murder My Dear Watson

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Eccentric, coldly rational, brilliant, doughty, exacting, lazy—in full bohemian color the world's most famous literary detective and his loyal companion Dr. John Watson investigate a series of prev...

Arthur Conan Doyle

By Daniel Stashower, Arthur Conan Doyle, Charles Foley, Jon Lellenberg

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Arthur Conan Doyle

By Daniel Stashower, Charles Foley, Jon Lellenberg

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A remarkable annotated collection of previously unpublished private correspondence from the creator of Sherlock HolmesThis extraordinary annotated collection of Sir Arthur Conan Doyle?s private cor...

Dangerous Work

By Daniel Stashower, Arthur Conan Doyle, Jon Lellenberg

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Dangerous Work

By Daniel Stashower, Arthur Conan Doyle, Jon Lellenberg

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Baker Street irregular

By Jon L. Lellenberg

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"Baker Street Irregular is a mystery and espionage tale told by a member of a whimsical Sherlock Holmes club born in a speakeasy, as Woody Hazelbaker undergoes America's political struggles in the...

Dangerous Work

By Daniel Stashower, Jon Lellenberg

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Baker Street Irregular

By Jon Lellenberg

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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.