Jens Ullrich Books

Sieben Bucher der Weisheit und Schonheit: Kolnerstrasse 334 & Alexanderstrasse 35 von 1997 bis 2004

By Christian Jendreiko, Jens Ullrich, Florian Baudrexel, Alexander Jasch, Dirk Conrad

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Das Schwarze Auge

By Jens Ullrich, Tobias Rafael Junge, Alex Spohr

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Regelwerkt der 5. Edition von DSA.

Die Schwarze Katze

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Printed in EU 2019

The Dark Eye: Bestiary of Aventuria

By Alex Spohr, Jens Ullrich, Dominic Hladek, Marie Monkemeyer

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Demon hunter. Chimera killer. Dragon slayer. Titles that bring honor and glory … But to claim one of these awe-inspiring titles, heroes must defeat these beasts. Horrifying and deadly monsters lur...

The Dark Eye - Core Rules Pocket Edition

By Alex Spohr, Jens Ullrich, Markus Plotz

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The Dark Eye’s Core Rules book presented in a soft-cover, digest-sized format. Same content and layout as the full-sized hardcover, just in digest size. The Dark Eye is Germany’s premiere fantasy...

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.