Michael Sontheimer Books

Potsdamer Strasse. Sittenbilder und Geschichten

By Benny Harlin, Michael Sontheimer

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Antes und Co. Geschichten aus dem Berliner Sumpf

By Michael Sontheimer, Jochen Vorfelder

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Einschusse. Besichtigung eines Frontverlaufs

By Michael Sontheimer, Otto Kallscheuer

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If you wanted to buy a top-quality condom in prewar Germany, you bought Fromms Act, the first brand name condom and still a leading brand in the German market. The man behind this "pure German qual...

Bilder des Zweiten Weltkriegs

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Kambodscha, Land der sanften Morder

By Michael Sontheimer

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Fromms

By Michael Sontheimer, Gotz Aly

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Fromms

By Gotz Aly, G Otz Aly

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Naturlich kann geschossen werden

By Michael Sontheimer

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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.