Knight Christopher Books

Onderzoek naar de mogelijkheid dat megalithische constructies van Stonehenge en in Bretagne tot stand zijn gebracht met behulp van geavanceerde wiskundig-astronomische kennis.

The Hiram key

By Knight Christopher

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The second Messiah

By Knight Christopher

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Is the Shroud of Turin genuine? For almost seven and a half centuries a piece of cloth was venerated because it bore the image of the crucified Christ, but in 1988 results of carbon dating showed t...

Art of the fifties, sixties, and seventies

By Knight Christopher

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Civilization one

By Knight Christopher

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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.