Gerald L. Posner Books

Mengele

By Gerald L. Posner

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The bio-assassins.

By Gerald L. Posner

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Secrets of the kingdom

By Gerald L. Posner

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The 9/11 Commission report called the Kingdom of Saudi Arabia "a problematic ally in combating Islamic extremism." To Posner, this is a gross understatement. In this book, he exposes the truth abou...

Secrets of the Kingdom

By Gerald L. Posner

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Secrets of the Kingdom

By Gerald L. Posner

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Secrets of the Kingdom

By Gerald L. Posner

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Case Closed

By Gerald L. Posner, Scott Aiello

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Belastet

By Gerald L. Posner

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Mengele

By Ana Mendoza, John Ware, Gerald L. Posner

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Los Hijos de Hitler

By Gerald L. Posner

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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.