John Coldwell Books

Oxford Reading Tree: Level 10: TreeTops Playscripts: The Masked Cleaning Ladies of Om

By John Coldwell

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Oxford Reading Tree: Level 11: TreeTops Playscripts: Bertha's Secret Battle

By John Coldwell

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Oxford Reading Tree: Level 11: TreeTops Playscripts: Bertha's Secret Battle

By John Coldwell, David Calcutt

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Treetops Playscripts are adaptations of popular stories from the Treetops series. All scripts are designed for classroom reading as well as staged performance, and can be performed by groups of as...

Y merched mewn mwgwd

By John Coldwell

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Tric y merched mewn mwgwd

By John Coldwell

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Y merched mewn mwgwd a't Mor-ladron

By John Coldwell

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Cynllun cyfrwys Sara

By John Coldwell

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Ffion a'r draenogod

By John Coldwell

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Cyfle mawr Manon

By John Coldwell

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The Masked Cleaning Lady Save the Day

By Michaela Morgan

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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.