Rupert Butler Books

This is a detailed history of Heinrich Himmler's evil organization, whose 20,000 members were responsible for the internal security of the Reich. Based upon the Gestapo's own archives and eye-witne...

Stalin Instrumentos de Terror

By Julio Marin, Rupert Butler, Maria Jose Anton

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La Gestapo The Gestapo

By Rupert Butler

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Black Angels

By Rupert Butler

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Legions of Death

By Rupert Butler

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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.