Christian Day Books

Pleiadian Principles for Living

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Wutz Handbuch Vakuumtechnik

By Bernhard Schimunek, Harald Grave, Uwe Friedrichsen, Boris Kossek, Werner Grosse Bley, Karl Jousten, Markus Veldkamp, Norbert Muller, Klaus Galda, Alfons Junemann, Uwe Meissner, Christian Day, Frank Leiter, Felix Sharipov, Erik Lippelt, Robert Ellefson, Rudolf Lachenmann, Wolfgang Jitschin

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Witches Book of the Dead

By Christian Day

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The Witches' Book of the Dead

By Christian Day

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The spirits of the dead can confer magical talents, fame, love, and wealth on those brave enough to beseech them. In The Witches' Book of the Dead, modern-day Warlock Christian Day shows you how to...

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.