Roy Chester Books

Anger man

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When ACC David mallory and profiler Fiona Nightingale investigate three murders with a sinister connection, they release a dark evil that has been lurking in the depths of 'the ring' - a decade-old...

The God Slayer

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Vengeance

By Roy Chester

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Vengeance

By Roy Chester

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Vengeance

By Roy Chester

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Old Tom Young Tom

By Tom Adams

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Vengeanace

By Roy Chester

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Damocles Factor

By Roy Chester

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Marine geochemistry

By R. Chester

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Marine Geochemistry

By Roy Chester, Tim D. Jickells

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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.