Peter Gretzel Books

Musikhistorische Forschungsbeitrage aus Niederosterreich

By Peter Gretzel, Christian K. Fastl

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Die Urkunden und Briefe des Osterreichischen Staatsarchivs in Wien Abt. Haus Hof und Staatsarchiv

By Peter Gretzel

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Regesten Kaiser Friedrichs III. 1440 1493 nach Archiven und Bibliotheken geordnet

By Peter Gretzel

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This volume of abstracts of charters Emperor Frederick´s III in the series Regesta Imperii focusses on the last decade of his rule, in particular on the years between 1483 and 1488. They are based...

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.