Peter Kreeft Books

A Key to the Doctrine of the Eucharist

By Peter Kreeft, Anscar Vonier, Aidan Nichols, Abbot Vonier

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Faith and Reason

By Professor Peter Kreeft

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The Philosophy of Thomas Aquinas

By Peter Kreeft, Professor

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The Two Tasks of the Christian Scholar

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While nothing can equal or replace the adventure in reading Tolkien’s masterwork, The Lord of the Rings, Peter Kreeft says that the journey into its underlying philosophy can be another exhilaratin...

You Can Understand The Bible

By Peter Kreeft

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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.