Leonie Kooiker Books

The Magic Stone

By Leonie Kooiker

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Legacy of magic

By Leonie Kooiker

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A modern-day witch's apprentice, his skeptical friend, and an ancient book of magic come together in the course of a hunt for a hidden legacy of priceless coins.

Legacy of magic

By Leonie Kooiker

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A modern-day witch's apprentice, his skeptical friend, and an ancient book of magic come together in the course of a hunt for a hidden legacy of priceless coins.

The magic stone

By Leonie Kooiker

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Chris finds a magic stone and becomes the focus of interest for an association of witches, one of whom wants him to become her successor.

The magic stone

By Leonie Kooiker

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Chris finds a magic stone and becomes the focus of interest for an association of witches, one of whom wants him to become her successor.

De heksensteen

By Leonie Kooiker

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Het Levende Beeld in de Tempel

By Leonie Kooiker

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Het Oerlanderboek

By Leonie Kooiker

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De kraak

By Kooiker Leonie Pseud. Van J.M. Kooyker Romijn

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Een jongen die als kleuter is ontvoerd, woont sindsdien, onwetend van zijn afkomst, bij de familie van zijn kidnappers. Na een toevallige inbraak bij zijn echte ouders gaat de zaak aan het rollen....

Je kunt het niet meenemen

By Leonie Kooiker

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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.