John L. Allen Jr. Books

The Catholic Church: What Everyone Needs To Know

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A guide to the past, present, and future of the Catholic Church looks at the internal and external challenges the institution faces and how it can make itself relevant and improve its moral standin...

The Catholic Church: What Everyone Needs to Know

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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...

All the Pope s Men

By John L. Jr Allen

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The Rise of Benedict XVI

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

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The Rise of Benedict XVI

By John L. Jr Allen

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“Commendable and balanced . . . With crisp writing and an amazing attention to detail, Allen brings readers inside the papal jockeying, covering the days of mourning and the conclave.” —The Los Ang...

10 things Pope Francis wants you to know

By 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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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.