Rachael F. Heller Books

* After eating a full breakfast, are you hungrier before it's time for lunch, than you would be if you only had time for a cup of coffee?* Do you have a hard time stopping once you start to...

The Carbohydrate Addict's Gram Counter

By Rachael F. Heller, Richard F. Heller

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If you love to eat starches, snack foods or sweets, and have trouble stopping once you start, you may be a carbohydrate addict. Standard diets don't work for you simply because it's not a matter of...

Carbohydrate Addict's Fat Counter

By Rachael F. Heller, Dr. Rachael F. Heller, Dr. Richard F. Heller

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Carbohydrate Addict's Calorie Counter

By Rachael F. Heller, Dr. Rachael F. Heller, Dr. Richard F. Heller

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Carbohydrate Addict's Carbohydrate Counter

By Rachael F. Heller, Dr. Rachael F. Heller, Dr. Richard F. Heller

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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.