Donald E. Queller Books

The Venetian patriciate

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Medieval and Renaissance Venice

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For the first time in a generation, leading scholars of medieval and Renaissance Venice join forces to define the current state of the field. Forays into neglected aspects of Venetian studies revea...

The Latin conquest of Constantinople.

By Donald E. Queller

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Latin Conquest of Constantinople Major Issues in History

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The office of ambassador in the Middle Ages.

By Donald E. Queller

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The Fourth Crusade

By Donald E. Queller

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The Fourth Crusade

By Thomas F. Madden, Donald E. Queller

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Fourth Crusade

By Donald E. Queller

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The Fourth Crusade

By Donald E. Queller

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The Fourth Crusade

By Donald E. Queller

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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.