Tom Callahan Books

Arnie

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"In this definitive biography, veteran sportswriter Tom Callahan shines a spotlight on one of the greatest golfers ever to play the game, Arnold Palmer. The winner of more than ninety championships...

Arnie

By Tom Callahan

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Around the world in eighteen holes

By Tom Callahan

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The Bases Were Loaded and So Was I

By Tom Callahan

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Johnny U

By Tom Callahan

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Drawing on interviews with colleagues, competitors, and others, a portrait of legendary quarterback Johnny Unitas recalls his seventeen-year career with the Baltimore Colts and the athletic talents...

Johnny U

By Tom Callahan

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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 P...

The Bases Were Loaded and So Was I

By Tom Callahan

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In Search of Tiger

By Tom Callahan, Buck Schirner

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His father s son

By Tom Callahan

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From the time he entered the public consciousness as a two-year-old golf prodigy on The Mike Douglas Show, Eldrick "Tiger" Woods has often been viewed less as a human being and more as a ball-strik...

In Search of Tiger

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.