Johann Gerhard Books

Methodus Studii Theologici

By Johanne Gerhardo

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Gnadengegenwart

By Renate Steiger

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Erkl ahrung der Historien des Leidens und Sterbens unseres Herrn Christi Jesu nach den vier Evangelisten: 1611

By Gerhard Johann Hrsg. Steiger Johann Anselm

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On the End of the World and on Hell

By Concordia Publishing House

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Theological Commonplaces

By Johann Gerhard

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In On Justification by Faith, the latest relase in the English translation of Gerhard's Theological Commonplaces, Gerhard defines justification in regard to Calvinism and the Christian life. He dra...

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.