William L. Petersen Books

Blue Neon Night: Michael Connelly's Los Angeles DVD

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Gospel Traditions in the Second Century

By William L. Petersen

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Tatian's Diatessaron

By William Lawrence Petersen, William L. Petersen

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A gospel harmony composed c. 172 CE, the Diatessaron is one of the earliest witnesses to the gospels. Regarded as the first version of the gospels in Latin, Syriac and Armenian, the Diatessaron was...

Sayings of Jesus Canonical and Non Canonical

By J. Vos, William Lawrence Petersen, Tjitze Baarda, J. S. Vos, H. J. De Jonge

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Patristic and Text Critical Studies

By Jan Krans, Joseph Verheyden

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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.