Daniel O Brien Books

How to Fight Presidents

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Make no mistake: Our founding fathers were more bandanas-and-muscles than powdered-wigs-and-tea. As a prisoner of war, Andrew Jackson walked several miles barefoot across state lines while sufferi...

Your presidential fantasy dream team

By Daniel O Brien

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What if a zombie apocalypse or a robot uprising threatened the nation and you had the power to recruit some of the nation s finest presidents to help save the day? By studying the most successful s...

Your Presidential Fantasy Dream Team

By Daniel O Brien, Winston Rowntree

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Paul Newman

By Daniel O Brien

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Robert Altman

By Daniel O Brien

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Clint Eastwood

By Daniel O Brien

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The Frank Sinatra Film Guide

By Daniel O Brien

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Robert Altman

By Daniel O Brien

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Hume s Enquiry Concerning Human Understanding

By Daniel O Brien, Alan Bailey

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Hume s Enquiry Concerning Human Understanding

By Daniel O Brien, Alan Bailey

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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.