Peter Kelder Books

Die funf Tibeter

By Peter Kelder, Birgit Petrick Sedlmeier

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Ancient Secret of the Fountain of Youth

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Offering practical instruction on how to perform the Tibetan Rites of Rejuvenation, which will take only minutes a day, many practitioners have experienced benefits, including increased energy, wei...

El secreto tibetano de la eterna juventud

By Peter Kelder

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Ancient Secret of the Fountain of Youth

By Peter Kelder

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Tibetan Secrets of Youth and Vitality

By Peter Kelder

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Eye of Revelation

By Peter Kelder

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Ancient secret of the Fountain of Youth .

By Peter Kelder

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Ancient Secret of the Fountain of Youth

By Peter Kelder

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Ancient Secret of the Fountain of Youth Book 2

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Secreto Tibetianio El

By Peter Kelder

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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.