Mark Geller Books

Healing Magic and Evil Demons

By Markham J. Geller

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Poetry by Mark B. Geller M. Ed. B. F. A. CMT

By Mark Geller

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My life in the 7th grade

By Mark Geller

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Marvin Berman's seventh grade diary reflects the ups and downs of his school year and his gradual realization of the true meaning of friendship.

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.