John Marlowe Books

Mission to Khartum: the apotheosis of General Gordon.

By John Marlowe

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History

By John Marlowe, Robert Skapura

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The World s Most Evil Serial Killers

By Victor McQueen, Charlotte Greig, Al Cimino, Jo Durden Smith, Paul Roland, John Marlowe, Richard Brown

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This book is a study of the warped thinking that went into some of the world's most macabre crimes, as well as a clinical examination of the purpose-built rooms, hidden spaces, and soundproof dunge...

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.