Catharina Valckx Books

Waldo und die geheimnisvolle Kusine

By Catharina Valckx

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Billy feiert Geburtstag

By Catharina Valckx

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Lizette s green sock

By Catharina Valckx

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Lizette tries to figure out what to do with the one green sock that she finds while out walking one day.

Bruno

By Catharina Valckx

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Bruno the cat recounts six interesting days in his life, from a peculiar day when he joins a fish underwater to an almost perfect day when he makes a list of what would constitute a perfect day and...

Zanzibar

By Catharina Valckx

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Le Roi et la Poule

By Catharina Valckx

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Le Roi et la Poule

By Catharina Valckx

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Un tresor bien cache

By Catharina Valckx

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Docteur Fred et Coco Dubuffet

By Catharina Valckx

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Miam des epinards

By Catharina Valckx

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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.