John L., Jr Allen Books

Benedicto XVI

By John L. Jr. Allen

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Leonardo Da Vinci

By John L. Jr Allen

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Student Atlas of World Politics

By Christopher J. Sutton, John L. Jr Allen

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The Catholic Church: What Everyone Needs to Know

By John L. Allen

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Cardinal Ratzinger

By John Allen, John L. Allen

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"John Allen's book goes a long way toward explaining the central enigma surrounding Ratzinger: How did this erstwhile liberal end up as the chief architect of the the third great wave of repression...

Pope Benedict XVI

By John . Jr Allen

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Catholic Church

By John L. Jr Allen

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Catholic Church

By John L. Jr Allen

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To Light a Fire on the Earth

By Robert Barron With John L. Allen Jr.

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The highly anticipated follow-up to Bishop Robert Barron's hugely successful Catholicism: A Journey to the FaithAs secularism gains influence, and increasing numbers see religion as dull and back...

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.