John S. Duffield Books

Over a Barrel

By John Duffield, John S Duffield

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World power forsaken

By John S. Duffield

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Drawing on interviews and other primary source materials, this comprehensive study examines in detail each of the central issues of Germany's security policy since 1990: its promotion of political...

World Power Forsaken

By John S. Duffield

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Fuels Paradise

By John S. Duffield

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Balance Sheet

By Peter Dombrowski, John S. Duffield

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Toward a Common European Union Energy Policy

By John S. Duffield, Vicki L. Birchfield

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Fuels Paradise

By John S. Duffield

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Making Renewable Electricity Policy in Spain

By John S. Duffield

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Making Renewable Electricity Policy in Spain

By John S. Duffield

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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.