George E. Demacopoulos Books

Five Models of Spiritual Direction in the Early Church

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Five Models of Spiritual Direction in the Early Church explores the struggles of five clerics (Athanasius, Gregory Nazianzen, Augustine of Hippo, John Cassian, and Pope Gregory I) to reconcile thei...

Gregory the Great

By George E. Demacopoulos

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Five Models of Spiritual Direction in the Early Church

By George E. Demacopoulos

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Gregory the Great

By George E. Demacopoulos

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The Invention of Peter Apostolic Discourse and Papal Authority in Late Antiquity Divinations Rereading Late Ancient Religion

By George E. Demacopoulos

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"On the first anniversary of his election to the papacy, Leo the Great stood before the assembly of bishops convening in Rome and forcefully asserted his privileged position as the heir of Peter th...

Colonizing Christianity

By George E. Demacopoulos

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Gregory the Great

By George E. Demacopoulos

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Invention of Peter

By George E. Demacopoulos

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The Invention of Peter

By George E. Demacopoulos

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Orthodox Constructions of the West

By George E. Demacopoulos, Aristotle Papanikolaou

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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.