Helene Montardre Books

Alexandre le Grand

By Helene Montardre, Gilles Scheid

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Un mystere sous l ocean

By Helene Montardre

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Quand, à quelques dizaines de mètres de chez eux, l'océan commence à bouillonner et à sentir mauvais, Lisbeth et Matt  s'imaginent qu'un dragon a élu domicile sous l'eau. Mais l'explication...

Apprentis chercheurs

By Laurent Audoin, Helene Montardre

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L exploit de Gustave Eiffel

By Helene Montardre, Glen Chapron

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Les apprentis chercheurs

By Helene Montardre, Laurent Audouin

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Hercule et le lion de Nemee

By Helene Montardre

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Hercule et l hydre de Lerne

By Helene Montardre, Alban Marilleau

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Achille le guerrier

By Helene Montardre

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Le labyrinthe de Dedale

By Helene Montardre

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Persee contre Meduse

By Helene Montardre, Nicolas Duffaut

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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.