Christopher Peter Grey Books

Disney Pixar Cars Drive On Adventures Disney Pixar Cars

By Reader S Digest

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Leonardo s boy

By Christopher Grey, Christopher Peter Grey

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Fifteen-year-old Giacomo--servant to Leonardo da Vinci--helps his procrastinating master finish painting "The Last Supper" while also trying to find clues to his parentage and pursue his own career...

Leonardo s Shadow

By Christopher Peter Grey

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Leonardo s shadow or My astonishing life as Leonardo da Vinci s servant

By Christopher Grey, Christopher Peter Grey

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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.