Marc Gellman Books

How Do You Spell God

By Monsignor Thomas Hartman, Marc Gellman, Jos A. Smith

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Lost & Found: A Kid's Book for Living through Loss

By Marc Gellman

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Describes different kinds of losses--losing possessions, competitions, health, trust, and the permanent loss because of death--and discusses how to handle these situations.

Where does God live?

By Marc Gellman

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A rabbi and a monsignor of the Catholic Church answer common questions about God and demonstrate that Jews and Christians, although they worship differently, are worshiping the same God.

Where Does God Live

By Gellman Marc Hartman Thomas

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Where Does God Live

By Thomas Hartman, Marc Gellman

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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.