Allen Guelzo Books

For the union of Evangelical Christendom

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Journal of the Shenandoah Valley During the Civil War Era

By Barton Myers, Scott Patchan, Margaretta Barton Colt, Jonathan A. Noyalas, Harrison Colt, Andre Pazik, Allen Guelzo, Jeffrey Felton, Dennis Kellison

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For The Union Of Evangelical Christendom The Irony Of The Reformed Episcopalians

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Gettysburg

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Winner of the Guggenheim-Lehrman Prize in Military HistoryAn Economist Best Book of the YearA Kirkus Reviews Best Nonfiction Book of the YearThe Battle of Gettysburg has been written about at lengt...

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.