Tom Callahan Books

Arnie: The Life of Arnold Palmer

By Tom Callahan

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Arnie Lib E: The Life of Arnold Palmer

By Tom Callahan

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Arnie: The Life of Arnold Palmer

By Tom Callahan

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Tom Callahan has written the seminal book on golfing great Tiger Woods. Woods, who has gone out of his way to protect his privacy, has never allowed himself to get close enough to a writer to be pr...

Johnny U

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In a time “when men played football for something less than a living and something more than money,” John Unitas was the ultimate quarterback. Rejected by Notre Dame, discarded by the Pittsburgh St...

The GM

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In the summer of 2006, the NFL’s most senior general manager, Ernie Accorsi, invited Tom Callahan “inside” the Giants organization to experience a season—Accorsi’s last—from the front office, the l...

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.