Karl Ruhmann Books

Phillibert fliegt.

By Karl Ruhmann, Rolf Siegenthaler

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Mais moi je veux

By Karl Ruhmann

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Pour faire tout ce qui lui plait, un petit garçon décide d'envoyer sa maman sur la lune. Mais qui va lui raconter son histoire si maman n'est pas là?

Et pourtant ... Philibert vole

By Karl Ruhmann

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Philibert le pingouin vole, mais une mouette lui fait remarquer qu'il n'a rien à faire dans le ciel. Décontenancé, il tombe sur la banquise. Il est bien triste. Il rencontre un phoque qui le consol...

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.