John A. Hardon Books

Christianity in the Twentieth Century

By John A. Hardon

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Protestant Churches of America

By John A. Hardon

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The Catholic catechism

By John A. Hardon

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"This volume is intended to meet a widely felt need for an up-to-date and concise source book on the principal teachings of the Catholic Church. Since the close of the Second Vatican Council, there...

Modern Catholic Dictionary

By John A. Hardon, John Hardon

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The Question and Answer Catholic Catechism

By John Hardon

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The question and answer format is the most popular way of providing specific answers to specific quetions about Catholicism. Father John A. Hardon, using the material from his best-selling Catholic...

The Treasury of Catholic wisdom

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The Catholic lifetime reading plan

By John A. Hardon

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Pocket Catholic Dictionary

By John A. Hardon

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Pocket Catholic Dictionary is a comprehensive, one-volume reference work containing definitions and explanations of the key terms of Catholicism. Father Hardon has carefully selected some 2,000 ent...

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.