Greg Critser Books

Skinny Rules

By Bob Harper, Greg Critser

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National Geographic Traveler: California, 5th Edition

By Greg Critser

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The Skinny Rules: The Simple, Nonnegotiable Principles for Getting to Thin

By Bob Harper, Greg Critser

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Skinny Habits: The 6 Secrets of Thin People

By Bob Harper, Greg Critser

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Jumpstart to Skinny: The Simple 3-Week Plan for Supercharged Weight Loss

By Bob Harper, Greg Critser

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#1 NEW YORK TIMES BESTSELLER • LOSE UP TO 20 POUNDS IN 21 DAYS!In The Skinny Rules, celebrity trainer and coach of NBC’s The Biggest Loser Bob Harper delivers the ultimate strategy for healthy, lon...

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.