Robert Leonhard Books

The Art of Maneuver

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The Art of Maneuver is an important theoretical study of an issue that is currently the subject of much discussion in professional military journals and symposia.

Fighting by Minutes

By Robert Leonhard

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Undergrounds in Insurgent Revolutionary and Resistance Warfare Assessing Revolutionary and Insurgent Strategies Series

By Robert Leonhard, Paul Tompkins, U. S. Army U.S. Army Special Operations Command

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First Responder Finance

By Robert Leonhard

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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.