James P. Duffy Books

War at the End of the World

By James P. Duffy, Joe Barrett

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Cutting College Costs

By James P. Duffy

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Sailboat chartering

By Melvin H. Ross

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Target America

By James P. Duffy

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Lindbergh vs. Roosevelt

By James P. Duffy

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Charles Lindbergh was an American patriot who was subject to one of the most successful smear campaigns in American history. Angered by Lindbergh's criticism, President Roosevelt launched against h...

Target Hitler

By James P. Duffy

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From the Back Cover: From the earliest attempts in 1923 to the von Stauffenberg bomb plot of July 20, 1944 many tried and failed to kill the founder and head of the Nazi Party who had become the su...

Target Hitler

By James P. Duffy

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Return to Victory

By James P. Duffy

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Return to Victory

By James P. Duffy

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Return to Victory

By James P. Duffy

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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.