John L. Allen Jr. Books

Conclave: The Politics, Personalities and Process of the Next Papal Election

By John Allen, John L. Allen Jr., John L. Allen

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"The next time a conclave unfolds in Rome, some 6,000 journalists are expected to descend on the Eternal City to cover the death of John Paul II and report on the election of his successor. Conclav...

All the Pope's Men: The Inside Story of How the Vatican Really Thinks

By John L. Allen Jr., John L. Allen

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Publisher description: A fascinating and enlightening look at the world's oldest and most mysterious institution, written by an American journalist with unparalleled knowledge about the Vatican's p...

The Rise of Benedict XVI

By John L. Allen Jr., John L. Allen

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Shahbaz Bhatti

By John L. Allen Jr.

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Pope Benedict XVI

By John L. Allen Jr.

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Pope Benedict XVI

By John L. Allen Jr., John L. Allen

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Catholic Church

By John L. Allen Jr.

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The Global War on Christians

By John L. Allen Jr.

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One of the most respected journalists in the United States and the bestselling author of The Future Church uses his unparalleled knowledge of world affairs and religious insight to investigate the...

Luke 10 Leadership

By Dave Heney, John L. Allen Jr.

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Christ in the Storm

By Pope Francis, John L. Allen Jr.

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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.