John Hardon Books

The Catholic Catechism

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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...

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...

Pocket Catholic Catechism

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This comprehensive and portable catechism is ideally suited to the needs of the inquirer as welll as for private or group study. Here are the major elements of the Catholic faith within the areas o...

Theology of Prayer

By John Hardon

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Basic Catholic Catechism

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Prophet for the Priesthood

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Catholic Dictionary

By John Hardon

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John Hardon's comprehensive, one-volume work of reference defining the keyterms of Catholicism; updated to include the most recent developments in theCatholic Church.Clear, concise, and faithful, w...

Holiness in the Church

By John Hardon

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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.