Robert Delfino Books

Does God Exist

By Robert Delfino, Matt Fradd

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Does God Exist

By Robert Delfino, Matt Fradd

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Philosophical Legacy of Jorge J. E. Gracia

By Jonathan J. Sanford, Robert Delfino, William Irwin

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Does God Exist?

By Robert Delfino, Matthew Fradd

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If you want an easy and fun way to understand St. Thomas Aquinas's five arguments for the existence of God, this book is for you. Written as dialogue between Lucy and AJ in a coffee shop, these arg...

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.