Lisa Tetzner Books

The Black brothers

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In the middle of the 19th century, poor farmers from Ticino sold their children across the Swiss-Italian border to work as "living broomsticks" in the chimneys of Milan. Thirteen-year-old Giorgio's...

War Paul schuldig?

By Lisa Tetzner

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Die schwarzen Bruder

By Lisa Tetzner

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Die Kinder aus Nr. 67. Cassette. Horspiel. Ab 8 Jahren .

By Lisa Tetzner

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Die Kinder aus Nr. 67. CD. Erwin und Paul die Geschichte einer Freundschaft.

By Lisa Tetzner

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Die schwarzen Bruder

By Lisa Tetzner

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Die Kinder aus Nr. 67 Band 2

By Lisa Tetzner

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Die Schwarzen Bruder

By Lisa Tetzner

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Die schwarzen Bruder. Roman in Bildern.

By Lisa Tetzner, Hannes Binder

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Die schwarzen Bruder. Gesamtausgabe. Erlebnisse und Abenteuer eines kleinen Tessiners.

By Lisa Tetzner

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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.