William Duba Books

The forge of doctrine

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A rare survival provides unmatched access to the medieval classroom. In the academic year 1330-31, the Franciscan theologian, William of Brienne, lectured on Peter Lombard?s Sentences and disputed...

Gerald Odonis Doctor Moralis and Franciscan Minister General

By Lambertus Marie De Rijk, Chris Schabel, William Duba

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Reportatio IIA Quaestiones in Secundum Librum Sententiarum Qq. 13 27

By Emmanuel Babey, Franciscus De Franciscus De Marchia, Tiziana Suarez Nani, Girard Etzkorn, William Duba

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Actes de Famagouste du notaire genois Lamberto di Sambuceto decembre 1299 septembre 1300

By Michel Balard, William Duba, Christopher David Schabel

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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.