Denis J. Hauptly Books

The journey from the past

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Traces the history of western civilization from the emergence of the first true humans in East Africa through the 1960's, including developments in Africa, South America, and Islamic countries.

In Vietnam

By Denis J. Hauptly

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Discusses the turbulent history of Vietnam from the Chinese invasion 2000 years ago through the United States' involvement during the 1960s.

A convention of delegates

By Denis J. Hauptly

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Describes the events occurring before and during the Constitutional Convention, in which delegates from the thirteen original states struggled to agree on a Constitution.

Puerto Rico

By Denis J. Hauptly

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Examines the history, culture, society, and future of this beautiful island in the Caribbean Sea.

Five Roads to the West

By Denis J. Hauptly

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Something Really New

By Denis J. Hauptly

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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.