Robert Ludlum Books

The Fourth Reich is waiting to arise—and the only man who can stop it is about to sign its birth certificate. In 1945 the children of the Third Reich were secretly hidden all over the world, to be...

Bourne ultimatum Saigo no ansatsusha. 2 Japanese Edition

By Robert Ludlum

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The Bourne Ultimatum Saigo no ansatsusha Japanese Edition

By Robert Ludlum

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The Janson directive

By Robert Ludlum

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The sigma protocol

By Robert Ludlum

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Published posthumously, Ludlum's last novel is a high-wire drama featuring a worldwide conspiracy hatched by the evil Sigma group. An American investment banker is on holiday in Switzerland when a...

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.