Michael Gienger Books

"A full-color guide to crystal massage for healing, energy balance, and stress release in the physical, emotional, and energetic bodies [bullet] Illustrates full-body massage techniques with crysta...

Crystal Power Crystal Healing

By Michael Gienger

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Healing Crystals

By Michael Gienger

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The Healing Crystals First Aid Manual

By Michael Gienger

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Crystal Power Mythology and History

By Andreas Gurh, Jorg Nagler

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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.