Chris R. Armstrong Books

Patron saints for postmoderns

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A professor of church history, Armstrong provides rich portraits of ten people from the past who: translated the gospel for their own times; broke down barriers; ministered out of the brokenness we...

Medieval Wisdom for Modern Christians

By Chris R. Armstrong, Jon Gauger

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Patron Saints for Postmoderns

By Chris R. Armstrong

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Medieval Wisdom for Modern Christians

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Many Christians today tend to view the story of medieval faith as a cautionary tale. Too often, they dismiss the Middle Ages as a period of corruption and decay in the church. They seem to assume t...

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.