Christopher A. Castaldo Books

Holy Ground: Walking with Jesus as a Former Catholic

By Chris Castaldo

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The Unfinished Reformation

By Gregg Allison, Christopher A. Castaldo

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Holy Ground

By Christopher A. Castaldo

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Journeys of faith

By Robert L. Plummer

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"Research indicates that on average, Americans change their religious affiliation at least once during their lives. Today, a number of evangelical Christians are converting to Catholicism, Eastern...

Talking with Catholics about the Gospel

By Chris Castaldo

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Talking with Catholics about the Gospel

By Christopher A. Castaldo

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Unfinished Reformation

By Gregg Allison, Christopher A. Castaldo

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Fe Renovada

By Christopher A. Castaldo

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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.