Petra Hammesfahr Books

The Sinner

By Petra Hammesfahr

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The lie

By Petra Hammesfahr

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After meeting Susanne Lasko, a desperate, unemployed divorcee, by chance, Nadia Trenkler, a stylish Berlin investment counselor, hires Susanne, whom she closely resembles, to spend the weekend with...

Le discret Monsieur Genardy

By Petra Hammesfahr

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Der Engel mit den schwarzen Flugeln.

By Petra Hammesfahr

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Der Engel mit den schwarzen Flugeln.

By Petra Hammesfahr

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Der glaserne Himmel

By Petra Hammesfahr

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Die Mutter. 4 CDs.

By Petra Hammesfahr, Iris Berben

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Das letzte Opfer. 3 Cassetten.

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Der Puppengraber

By Hammesfahr

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Lukkas Erbe.

By Petra Hammesfahr

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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.