John W. M. Chapman Books

Hitler s Oil Broker

By John W. M. Chapman

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Ultranationalism in German Japanese Relations 1930 1945

By John Chapman

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This study focusing on the ultranationalist regimes in Germany and Japan during the 1930s and 1940s examines in biographical format the roles played by individuals significantly involved in the dri...

Richard Sorge the GRU and the Pacific War

By John W. M. Chapman

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Richard Sorge the GRU and the Pacific War

By John W. M. Chapman

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Ultranationalism in German Japanese Relations 1930 1945

By John W. M. Chapman

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Rethinking the Russo Japanese War 1904 5 Volume 2

By John W. M. Chapman, Chiharu Inaba

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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.