Helen Geyer Books

Das venezianische Oratorium 1750-1820

By Helen Geyer

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Luigi Cherubini

By Helen Geyer, Michael Pauser

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Alte Musik in der Kulturlandschaft Thuringens

By Helen Geyer, Franz Korndle, Christian Storch

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Weibliche Mythen in Musik Literatur und bildender Kunst

By Helen Geyer

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Die Weimarer Bachsohne

By Maria Stolarzewicz, Helen Geyer

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In Weimar wurden zwei für die Nachwelt sehr bedeutsame Bachsöhne geboren: Wilhelm Friedemann (1710-1784) und Carl Philipp Emanuel Bach (1714-1788). Sie wirkten in einer Zeit, die neue ästhetische u...

Verfolgte Musiker im nationalsozialistischen Thuringen

By Helen Geyer

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Die heroisch-komische Oper

By Helen Geyer

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Die heroisch-komische Oper

By Helen Geyer

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Luigi Cherubini

By Helen Geyer, Michael Pauser

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Psalmen

By Birgit Wertenson, Helen Geyer

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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.