Derek Lucas Books

On the stranger's mountain.

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When his father dies a twelve-year-old becomes head of the family and must not only make the decision to move the family to a new life in the West, but also see that the family obeys him in this fi...

Well Done, Secret Seven Secret Seven on the trail

By Enid Blyton

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Secret Seven Mystery Puzzle for the Secret Seven

By Enid Blyton

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Secret Seven Fireworks Good Old Secret Seven

By Enid Blyton

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Secret Seven Fireworks

By Enid Blyton

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Good Old Secret Seven

By Enid Blyton

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Airports Stand Stare Books

By Derek Lucas, Angela Lucas

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Building a house

By Angela Lucas

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Tugs Stand Stare Books

By Derek Lucas, Angela Lucas

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Focus on Earth

By Derek Lucas, Angela Lucas

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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.