James P. Duffy Books

Cutting College Costs

By James P. Duffy

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Cutting college costs

By James P. Duffy

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Hitler Slept Late and Other Blunders That Cost Him the War

By James P. Duffy

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Target Hitler: The Plots to Kill Adolf Hitler

By James P. Duffy

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TARGET: AMERICA: Hitler's Plan to Attack the United States

By James P. Duffy

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"Did Hitler mean to pursue global conquest once he had completed his mastery of Europe? In this starting reassessment of Hitler's strategic aims, Duffy argues that he fully intended to bring the wa...

Hitler's Secret Pirate Fleet: The Deadliest Ships of World War II

By James P. Duffy

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Learn While You Sleep

By James P. Duffy

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College Online: How to Take College Courses Without Leaving Home

By James P. Duffy

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How to Earn a College Degree Without Going to College

By James P. Duffy

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Czars

By Vincent L. Ricci, 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.