Johannes Fried Books

Stand und Perspektiven der Mittelalterforschung am Ende des 20. Jahrhunderts

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Charlemagne

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"When Charlemagne died in 814 CE, he left behind a dominion and a legacy unlike anything seen in Western Europe since the fall of Rome. Distinguished historian and author of The Middle Ages Johanne...

The Middle Ages

By Johannes Fried

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The crisis of the Anglo-German antagonism 1916-17

By Michael Howard

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Charlemagne

By Johannes Fried, James Cameron Stewart, Lewis Peter

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Donation of Constantine and Constitutum Constantini

By Johannes Fried

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Aufstieg aus dem Untergang.

By Johannes Fried

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Revolutionen des Wissens. Von der Steinzeit bis zur Moderne.

By Johannes Fried, Johannes Sussmann

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Karl der Grosse

By Johannes Fried

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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.