Eugen Sopko Books

Townsfolk and countryfolk

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Three city friends encounter numerous adventures when they decide to enrich the lives of countryfolk with their superior scientific knowledge.

The Miller His Son and Their Donkey

By Aesop, Eugen Sopko

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White Raven and the Black Sheep Th

By North South Staff, Eugen Sopko

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A white raven and a black sheep, each an outcast because he is a different color from his fellows, try to gain acceptance by switching places and discover along with their peers that color is not e...

Three Cats on Roof Postcard

By Eugen Sopko

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La princesse et l etoile du nord

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Fincas auf Mallorca.

By Lene Mayer Skumanz, Eugen Sopko

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Thalers des etoiles

By Eugen Sopko

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Der verlorene Schlussel

By Eugen Sopko

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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.