David R. Hamilton PHD Books

I Heart Me

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How much love do you have for yourself? Not the narcissistic 'Aren't I wonderful' kind of love, but the essential regard for self that empowers you and helps you navigate through life. The type of...

It's the Thought That Counts

By David R. Hamilton

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When pharmaceutical scientist David R. Hamilton, Ph.D., observed the results of tests on new drugs, he noticed that patients receiving control placebo pills reported the same level of improvement a...

I Heart Me

By David R. Hamilton

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Five Side Effects of Kindness

By David R. Hamilton

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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.