Achim Gnann Books

Michelangelo als Zeichner

By Achim Gnann, Michelangelo Buonarroti, Claudia Echinger Maurach, Joachim Poeschke

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Polidoro da Caravaggio (um 1499-1543)

By Achim Gnann

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Karl Hubbuch und seine Modelle

By Achim Gnann

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Michelangelo The Drawings of a Genius

By Achim Gnann

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Traces the genesis and dissemination of chiaroscuro woodcuts in 16th-century Germany, Italy, and the Netherlands, with more than 130 examples including masterpieces by Cranach, Beccafumi, and Goltz...

In Farbe

By Achim Gnann

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Raphael

By Achim Gnann

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Masterpieces of the Albertina

By Achim Gnann, Klaus Albrecht Schroder, Christine Ekelhart, Marietta Mautner Markhof, Maren Groning

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Parmigianino und sein Kreis

By Achim Gnann

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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.