Allen J. Frantzen Books

Bloody Good: Chivalry, Sacrifice, and the Great War

By Allen J. Frantzen

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Before the Closet

By Allen J. Frantzen

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Since the publication of John Boswell's Christianity, Social Tolerance, and Homosexuality, historians have accepted the view that the early Middle Ages tolerated and even fostered same-sex relation...

Before the Closet

By Allen J. Frantzen

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Speaking Two Languages

By Allen J. Frantzen

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Speaking Two Languages

By Allen J. Frantzen

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Troilus and Criseyde

By Allen J. Frantzen

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If "variety distinguishes Chaucer's handling of his materials," as Allen J. Frantzen writes his preface to this volume, it also distinguishes Frantzen's handling of his materials - the contents and...

King Alfred

By Allen J. Frantzen

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Troilus and Criseyde

By Allen J. Frantzen

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Anglo-Saxonism and the construction of social identity

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The literature of penance in Anglo-Saxon England

By Allen J. Frantzen

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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.