Gillespie David Books

The sweet poison quit plan

By David Gillespie

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The Sweet Poison Quit Plan is the long-awaited 'how to' supplement to the best-selling Sweet Poison.

Toxic oil

By David Gillespie

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'Vegetable oils give you cancer. Every extra mouthful of vegetable oil you consume takes you one step closer to a deadly (and irreversible) outcome.' With these words David Gillespie begins his fol...

Free Schools

By Gillespie David

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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.