David Ludwig Books

In good spirits

By David J. Ludwig

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College algebra

By Joan Van Glabek

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True Vipers

By David Ludwig, David Mallow, Goran Nilson

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Always Hungry

By David S. Ludwig

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"Inspired by the New York Times op-ed "Always Hungry," ALWAYS HUNGRY? will change everything readers ever thought about weight loss, diet, and health. Groundbreaking new research shows that calorie...

Always Hungry

By David Ludwig

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Always Hungry Lib E Conquer Cravings Retrain Your Fat Cells and Lose Weight Permanently

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Always Delicious

By David Ludwig, Dawn Ludwig

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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.