Allen C. Guelzo Books

Abraham Lincoln

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"More has been written about Abraham Lincoln than about any other American. Yet very little of this literature sees Lincoln as he was in his times - as a man of ideas, as a man of deep intellectual...

Abraham Lincoln

By Allen C. Guelzo

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Edwards in Our Time

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Lincoln s America 1809 1865

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Abraham Lincoln as a Man of Ideas

By Allen C. Guelzo

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Edwards on the will

By Allen C. Guelzo

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Robert E. Lee

By Allen C. Guelzo

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A WALL STREET JOURNAL BEST BOOK OF THE YEAR • From the award-winning historian and best-selling author of Gettysburg comes the definitive biography of Robert E. Lee. An intimate look...

Abraham Lincoln

By Edward Lewis, Allen C. Guelzo

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Fateful Lightning

By Brian Holsopple, Allen C. Guelzo

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Redeeming the Great Emancipator

By Will Damron, Guelzo Allen C.

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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.