Dr. John Douillard Books

Colorado Cleanse 4.0

By Dr. John Douillard

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The Yoga Body Diet

By Kristen Schultz Dollard, Dr. John Douillard

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A yoga body is the one you have now, only healthier. This book is your complete guide to how to get it. And the benefits don't stop at your appearance. At the end of 4 short weeks, you'll feel bett...

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.