Stephan Koja Books

German Impressionist Landscape Painting: Liebermann - Corinth - Slevogt

By Angelika Wesenberg, Stephan Koja, Nicole Hartje Grave, Bernhard Geil

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Mit Blick auf Monet

By Stephan Koja

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Renaissance and Baroque masterpieces

By Stephan Koja, Claudia Kryza Gersch

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Designed by Gottfried Semper, the gallery building at the Dresden Zwinger houses not only the Gemäldegalerie Alte Meister (Old Masters Picture Gallery), but also the Skulpturensammlung bis 1800 (Sc...

Shadows of Time

By Stephan Koja, Claudia Kryza Gersch

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Rodin and Vienna

By Stephan Koja, Agnes Husslein Arco, Auguste Rodin

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Olympian Gods

By Ortrud Westheider, Stephan Koja, Michael Philipp

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Nordic Dawn

By Stephan Koja

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Gustav Klimt

By Stephan Koja

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Gustav Klimt

By Stephan Koja

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Georges Rouault

By Stephan Koja

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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.