Roger D. Hagood Books

China s Medicine Buddha Amulets

By Belinda Anne Kay, Roger D. Hagood, Robert T. Lee

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Chu Gar Gao

By Roger D. Hagood

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A rare treatise of Hakka Chu Gar Southern Praying Mantis boxing that includes: Chu Gar Mantis history, boxing transmission, six Chu Gar areas, three kinds of Chu Gar in China; Chu Gar Mantis person...

Chu Gar Skills

By Roger D. Hagood

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A rare bilingual (English-Chinese) compendium of various Hakka Chu Gar Southern Mantis Kungfu skills including: About Wooden Man Dummy training, About Yellow Ox Pole (Staff) form, About Dui-Jong pa...

Eighteen Buddha Hands

By Roger D. Hagood

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A rare instructional treatise of Chinese boxing from the Kwongsai Dragon-Tiger Mountain, Bamboo Forest Temple, Praying Mantis Clan, as transmitted by the late Grandmaster Lam Sang. Details include...

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.