John Mortimer Books

Light Blue for big ideas Green for mystery Orange for fantastic fiction Pink for distant lands Dark Blue for real lives Purple for viewpoints John Mortimer's 'Rumpole and the Penge Bungalow Murder...

Titmuss Regained

By John Mortimer

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Leslie Titmuss has risen to become Secretary of State at the Ministry of Housing, Ecological Affairs and Planning. But market forces are encroaching on Rapstone Valley. The question is should Titmu...

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.