Daniel E. Harmon Books

"With the capture of high-profile terrorists like Osama Bin Laden and accused Boston Marathon bombers Tamerlan and Dzhokhar Tsarnaev, military intelligence work is frequently in the headlines. This...

Special ops

By Daniel E. Harmon

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Special ops

By Daniel E. Harmon

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Careers as a marketing and public relations specialist

By Daniel E. Harmon

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Describes the career paths of marketing and public relations specialists, discussing necessary qualifications, education requirements, and available job opportunities.

Producing in Theater

By Daniel E. Harmon

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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.