Georges Duby Books

The Knight The Lady and the Priest: The Making of Modern Marriage in Medieval France

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"Until the Middle Ages, a king could marry his first cousin, a priest could have a wife and several concubines, and a nobleman could banish a wife if she didn't produce a son. Marriage was an instr...

William Marshall

By Georges Duby

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Knight Lady Priest

By Georges Duby

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William Marshal

By Georges Duby

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Georges Duby, one of this century's great medieval historians, has brought to life with exceptional brilliance and imagination William Marshal, adviser to the Plantagenets, knight extraordinaire, t...

Flower of Chivalry

By Georges Duby

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The chivalrous society

By Georges Duby

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The Chivalrous Society

By Georges Duby

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The Legend of Bouvines: War, Religion, and Culture in the Middle Ages

By Georges Duby

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France in the Middle Ages 987 1460

By Georges Duby

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France in the Middle Ages 987 1460

By Georges Duby

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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.