John Izzo PhD Books

Five Thieves of Happiness The

By Tom Dheere, John Izzo PhD

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Five Thieves of Happiness The

By Tom Dheere, John Izzo PhD

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The Five Thieves of Happiness

By John Izzo PhD

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“The only things holding you back from complete peace of mind are mental, and this book shows you how to remove these barriers once and for all.” —Brian Tracy, New York Times...

The Five Secrets You Must Discover Before You Die

By John Izzo PhD

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“What brought you the greatest joy? What do you wish you had learned sooner? What ultimately mattered and what didn’t?” asks Dr. John Izzo. Based on a highly acclaimed public tele...

Stepping Up Lib E: How Taking Responsibility Changes Everything

By John Izzo Ph.D., John Izzo Phd

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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.