John Christy Books

The Kidnapping of Michel Houellebecq

By John Christy, Genevieve Knapp

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The complete MG guide, model by model

By John Christy

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The complete MG guide, model by model

By John Christy

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Racing Cobra

By John Christy, Dave Friedman

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Carroll Shelby's Racing Cobra

By John Christy, Dave Friedman

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The definitive fictional biography of Kobe Bryant, with two forewords and an afterword by Kobe Bryant. John Christy argues that Bryant is a contemporary incarnation of Nietzsche's ubermensch, a str...

Hansel and Florian in the Black Forest

By John Christy

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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.