Jack Challem Books

Stop Prediabetes Now

By Jack Challem, Ron M.D. Hunninghake

Average: 0.00, 0 Ratings

Syndrome X

By Burton Berkson, Jack Challem, Melissa Diane Smith

Average: 0.00, 0 Ratings

The Soy Sensation

By Jack Challem, Victoria Dolby Toews, Linda Knittel

Average: 0.00, 0 Ratings

The Natural Health Guide to Beating the Supergerms: and Other Infections, Including Colds, Flus, Ear Infections and Even HIV

By Jack Challem, Richard P. Huemer

Average: 0.00, 0 Ratings

Vitamin C updated

By Jack Challem, Jack Joseph Challem

Average: 0.00, 0 Ratings

Abstract: Health benefits of vitamin C are discussed for the general public in view of selected research findings; controlled studies suggest its contribution to the prevention and correction of i...

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.