Mark Greaney Books

Tom Clancy Full Force and Effect

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A #1 NEW YORK TIMES BESTSELLER!From Mark Greaney, the New York Times bestselling author of Mission Critical and a coauthor of Tom Clancy's Jack Ryan novels, comes another high-stakes thriller featu...

Relentless

By Mark Greaney

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Relentless

By Mark Greaney

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The Gray Man's search for missing intelligence agents plunges him deep into a maelstrom of trouble in the latest entry in the #1 New York Times bestselling series. The first agent disappearance was...

Sierra Six

By Mark Greaney

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Sierra Six

By Mark Greaney

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It's been years since the Gray Man's first mission, but the trouble's just getting started in the latest entry in the #1 New York Times bestselling series.Before he was the Gray Man, Court Gentry w...

The Gray Man

By Mark Greaney

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Relentless

By Mark Greaney

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Relentless

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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.