Gregory Shaw Books

Theurgy and the Soul: The Neoplatonism of Iamblichus

By Gregory Shaw

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Theurgy and the Soul

By Aaron Riches, Gregory Shaw, John Milbank

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Theurgy and the Soul

By Gregory Shaw, John Milbank

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Practicing Gnosis Ritual Magic Theurgy and Liturgy in Nag Hammadi Manichaean and Other Ancient Literature

By Gregory Shaw, John D. Turner, April D. DeConick

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"Ritual, magic, liturgy, and theurgy were central features of Gnosticism, and yet Gnostic practices remain understudied. This anthology is meant to fill in this gap and address more fully what the...

Practicing Gnosis

By Gregory Shaw, John D. Turner, April DeConick

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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.