Jeffrey Mass Books

The development of Kamakura rule, 1180-1250

By Jeffrey P. Mass

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Antiquity and Anachronism in Japanese History

By Jeffrey P. Mass, Jeffrey Mass

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Antiquity and Anachronism in Japanese History

By Jeffrey P. Mass, Jeffrey Mass

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The Origins of Japan s Medieval World

By Jeffrey P. Mass, Jeffrey Mass

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Yoritomo and the Founding of the First Bakufu

By Jeffrey P. Mass, Jeffrey Mass

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"This book is a much expanded and wholly rewritten treatment of the subject of the author's first book, Warrior Government in Early Medieval Japan, published in 1974. In this new version, the "warr...

The Origins of Japan s Medieval World

By Jeffrey P. Mass, Jeffrey Mass

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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.