Paul Christelis Books

Rabbit season

By Paul Christelis

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Breath by breath

By Paul Christelis

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Lenny and Rosa are having tough days, and it s hard to stay calm. Fortunately, their friend Sam is there to help! By teaching them how to use breathing exercises and other mindfulness techniques, S...

Exploring emotions

By Paul Christelis

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Everyone has different feelings about Sports Day at school. Sally feels excited, Mateo feels nervous, Manisha feels angry, Caleb feels sad, and Tom feels relieved. But they all soon discover that e...

Get outdoors

By Paul Christelis

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It s a beautiful day, but Jada and her brother Michael are staying indoors until Dad invents a game to get them exploring nature: whoever notices the most interesting things is the winner.

Sleep easy

By Paul Christelis

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Twins Billy and Betty are having trouble sleeping. Billy s mind is noisy, constantly chattering, keeping him awake. Betty finds that as soon as her eyes close she starts to worry about what will ha...

Take a Moment

By Paul Christelis

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Take a Moment

By Paul Christelis, Alex Hoskins

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Breath by Breath

By Franklin Watts, Elisa Paganelli, Paul Christelis

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Breath by Breath

By Elisa Paganelli, Paul Christelis

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Sleep Easy

By Elisa Paganelli, Paul Christelis

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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.