Robert C. Gregg Books

Shared Stories, Rival Tellings: Early Encounters of Jews, Christians, and Muslims

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"Judaism, Chritianity, and Islam are considered kindred religions--holding ancestral heritages and monotheistic belief in common--but there are definitive distinctions between these 'Abrahamic' peo...

Early Arianism

By R.C. Gregg, Robert C. Gregg

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Jews, pagans, and Christians in the Golan Heights

By Robert C. Gregg

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Early Arianism--a view of salvation

By Robert C. Gregg

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Athanasius

By Athanasius Saint Patriarch Of Alexandria, Robert C. Gregg

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Glory of angels

By Robert C. Gregg

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Arianism Historical and Theological Reassessments

By Robert C. Gregg

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Consolation Philosophy

By Robert C. Gregg

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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.