Tom Callahan Books

A LOOK AT THE NFL’S TOUGHEST JOB, A MAN WHO MASTERED IT, AND THE ART OF WINNING CHAMPIONSHIPSWith a New Chapter on the Giants’ Super Bowl TriumphThe GM is a chronicle of the NFL spanning the last t...

Around the World in 18 Holes

By Dave Kindred, Tom Callahan

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In Search of Tiger

By Tom Callahan

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Arnie

By Tom Callahan

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Gods at Play an Eyewitness Account of Great Moments in American Sports

By Tom Callahan

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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.