David Callahan Books

Dangerous Capabilities: Paul Nitze and the Cold War

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Between two worlds

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With Between Two Worlds, David Callahan, author of Dangerous Capabilities: Paul Nitze and the Cold War, has written a provocative analysis of one of the most critical issues facing our nation: what...

State of the Union: A Novel

By David Callahan

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Lieutenant Zachary Turzin is the most decorated soldier on active duty in the U.S. armed services: A Gulf War veteran, he is fluent in Arabic and Farsi and flies Blackhawk helicopters. He's led a G...

The Cheating Culture: Why More Americans Are Doing Wrong to Get Ahead

By David Callahan

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The Moral Center: How We Can Reclaim Our Country from Die-Hard Extremists, Rogue Corporations, Hollywood Hacks, and Pretend Patriots

By David Callahan

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The Cheating Culture: Why More Americans Are Doing Wrong to Get Ahead

By David Callahan

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The Moral Center: How Progressives Can Unite America Around Our Shared Values

By David Callahan

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State of the union

By David Callahan

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State of the Union

By David Callahan

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Kindred Spirits

By David Callahan, Forbes Inc.

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"They stormed the beaches of Normandy and the islands of the South Pacific, but the exceptional generation of Americans that won World War II also produced the greatest group of business leaders of...

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.