David Poyer Books

The Threat: A Dan Lenson Novel

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Struggling to obtain the plans for a new Russian nuclear warhead, Navy commander Dan Lenson and his team are betrayed and barely escape with their lives, a situation that prompts an even more dange...

Korea Strait: A Novel

By David Poyer

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The Crisis: A Dan Lenson Novel

By David Poyer

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Ghosting: A Novel

By David Poyer

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Winter in the Heart

By David Poyer

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As the Wolf Loves Winter

By David Poyer

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The Only Thing to Fear: A Novel

By David Poyer

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A Russian assassin defects to the Germans during World War II and is taken by U-boat to Chesapeake Bay to kill President Roosevelt. The attempt is foiled by John F. Kennedy, who is no longer comman...

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.