Ronald K. Rittgers Books

The Reformation of Suffering: Pastoral Theology and Lay Piety in Late Medieval and Early Modern Germany

By Ronald K. Rittgers

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Age of Reform 1250 1550

By Steven Ozment, Carlos Eire, Ronald K. Rittgers

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Reformation of the Keys

By Ronald K. RITTGERS

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The Reformation of the Keys

By Ronald K. Rittgers

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This is a study of the role of Lutheran private confession in the German Reformation, which was part of a fundamental transformation to rid the Church and society of alleged clerical abuses and had...

Hebrews James Reformation Commentary on Scripture Series

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Hebrews James

By Ronald K. Rittgers

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Widower s Lament the Pious Meditations of Johann Christoph Oelhafen

By Ronald K. Rittgers

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Widower s Lament

By Ronald K. Rittgers

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Protestants and Mysticism in Reformation Europe

By Vincent Evener, Ronald K. Rittgers

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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.