Girard J. Etzkorn Books

The Vatican Library's Vaticanus Latinus collection is one of its largest holdings. The majority of the codices between the shelf numbers 3000 and 9000 remain as yet to be cataloged according to mod...

Guillelmi De Ockham

By Girard J. Etzkorn

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Guillelmi de Ockham

By Joseph C. Wey, Girard J. Etzkorn, William Of Ockham

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Questions on the Metaphysics of Aristotle by John Duns Scotus Text Series Number 19 Volume 1

By Allan Wolter, John Duns Scotus, Girard J. Etzkorn

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Questions on the Metaphysics of Aristotle by John Duns Scotus Text Series Number 19 Volume 2

By Allan Wolter, Girard J. Etzkorn

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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.