Patrick D. Reagan Books

Guide to History and the Internet

By Patrick D. Reagan

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America and the war with Iraq

By Patrick D. Reagan

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Designing a New America

By Patrick D. Reagan

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The mysteries of Elizabeth I

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"Beginning as early as 1890, a combination of intellectual and institutional developments - from the emergence of the social sciences as a guide to rational management to the reform efforts of the...

Forever Friends

By Becky Kelly, Patrick D. Reagan

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For the General Welfare Essays in Honor of Robert H. Bremner American University Studies Series IX History Vol 48

By Frank Annunziata, Roy T. Wortman, Patrick D. Reagan

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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.