Christian Feldmann Books

Pope John XXII

By Christian Feldman, Christian Feldmann

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"Angelo Roncalli was pope for only five years, yet he won the hearts and minds of people the world over, including many non-Catholics with his warm style and commitment to bring the Catholic Church...

Mere Teresa

By Frere Roger Schutz De Taize, Christian Feldmann

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Les rebelles de Dieu

By Christian Feldmann

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Biochemie des Menschen

By Florian Horn

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Physiologie

By Rainer Klinke, Christian Bauer

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Wir hatten schreien mussen. Das Leben des Dietrich Bonhoeffer.

By Christian Feldmann

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Hildegard von Bingen

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Henri Nouwen

By Christian Feldmann

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Liebe bleibt

By Christian Feldmann

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Edith Stein. Judin Atheistin Ordensfrau.

By Christian Feldmann

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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.