Marc Gellman Books

And God Cried, Too: A Kid's Book of Healing and Hope

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The angel Gabriel helps Mikey, an angel-in-training, to understand why bad things happen for what seems to be no reason and how to hold on to hope and faith during difficult times.

And God Cried, Too: A Kid's Book of Healing and Hope

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Does God Have a Big Toe?: Stories About Stories in the Bible

By Marc Gellman

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Someday You'll Thank Me for This!

By Marc Gellman

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Nearly But Not Quite

By John Prater, Paul Rogers, Marc Gellman

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Bad Stuff in the News

By Gellman Marc Hartman Thomas

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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.