Christian Welz Books

Vorschriftensammlung fur die Verwaltung. Europarecht. Textausgabe mit Einfuhrung.

By Manfred Matjeka, Peter Reich, Christian Welz

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The European Social Dialogue under Articles 138 and 139 of the EC Treaty

By Christian Welz

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The concept of “social dialogue” pervades discussions of labour relations in Europe. In the estimation of many scholars and policymakers, the concept opens the way to an entirely new and potentiall...

Vorschriftensammlung Europarecht 6.ed.

By Manfred Matejka

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Die Neuauflage bietet eine umfassende Auswahl relevanter Vorschriften des primären und sekundären Unionsrechts in der Fassung des am 1. Dezember 2009 in Kraft getretenen Vertrags von Lissabon. Abge...

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.