Paul Kengor Ph.D. Books

11 Principles of a Reagan Conservative

By Paul Kengor Ph.D.

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The Communist Frank Marshall Davis

By Paul Kengor Ph.D., Pete Larkin

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11 principles of a Reagan conservative

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The Judge

By Paul Kengor, Patricia Clark Doerner

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We are witnessing a watershed moment in American cultural history: the sabotaging of family and marriage. Extreme-left radicals have made their arguments and tried different tactics, from the early...

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.