Dennis G. Palumbo Books

The Essence of Hakkoryu Jujutsu

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As you will see in your reading of this third book in the series on Hakkoryu Jujutsu, the waza of Sandan Gi are related in many ways to the Waza of Nidan.

The Secrets of Hakkoryu Jujutsu

By Palumbo Dennis

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The Secrets of Hakkoryu Jujutsu will show you the key to total control--how to create pain without unnecessary maiming. With just a flick of the wrist, your assailant is squirming in the dirt, begg...

Secret Nidan Techniques Of Hakkoryu Jujutsu

By Dennis G. Palumbo, Palumbo Dennis

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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.