Mark O Keefe Books

What are they saying about social sin?

By Mark O Keefe

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Priestly Prayer. Reflections on Prayer in the Life of the Priest

By Mark O Keefe

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The Spanish world of the sixteenth century -- The city of Ávila -- Honor, social class, and poverty -- Reform of the Church and religious orders -- The Carmelites -- The Monastery of the Incarnatio...

Deciding to be Christian

By Mark O Keefe

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Learned Experienced and Discerning

By Mark O Keefe

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To Live for God Alone

By Mark O Keefe, Maria Gonzalo Garcia

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Virtues Abounding

By Mark O Keefe

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Virtues Abounding

By Mark O Keefe

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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.