R. G. Johnston Books

Introduction to Sheep Farming

By R. G. Johnston, Richard G. C. Johnston

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Introduction to Sheep Farming

By R. G. Johnston

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Vinland the Beginning

By R. G. Johnston

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The first millenium is drawing to a close. As the old Viking gods are fading before the one god of Christianity, those aboard the Norse knarr Mimir have their own reasons for braving the dangerous...

Vinland Ragnarok Twi light of the Gods

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Book II in the Vinland Trilogy. Ragnarök, the twilight of the gods, has begun. The Jötunn overthrow Asgard, home of the Norse gods, forcing the exodus of its ruler Odin, and members of the house of...

Vulnerability Assessment

By R. G. Johnston

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Devil s Dictionary of Security Terms

By R. G. Johnston

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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.