C.J. Idzikowski Books

Beating Insomnia

By C.J. Idzikowski

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Learn to Sleep Well

By C.J. Idzikowski

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Learn to Sleep Well Kit

By C.J. Idzikowski

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Collins Need to Know? - Sleep: The secret to sleeping well and waking refreshed

By Christopher Idzikowski

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Looking at all the various sleep disorders, ranging from insomnia, restless leg syndrome and sleep apnoea to managing shift work and overcoming jet lag, this book offers solutions ranging from chan...

The Insomnia Kit

By C.J. Idzikowski

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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.