Christopher M. Andrew Books

"Defend the Realm" reveals the precise role of the Security Service in twentieth-century British history, from its foundation by Captain Kell of the British Army in October 1909, through two world...

Defence of the Realm

By Christopher Andrew

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The secret world

By Christopher M. Andrew

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"The history of espionage is far older than any of today's intelligence agencies, yet the long history of intelligence operations has been largely forgotten. The codebreakers at Bletchley Park, the...

The Secret World

By Christopher Andrew

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Defend the Realm

By Christopher M. Andrew

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For over 100 years, the agents of MI5 have defended Britain against enemy subversion. Their work has remained shrouded in secrecy—until now. This first-ever authorized account reveals the British S...

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.