Theodore Appel Books

Recollections Of College Life, At Marshall College, Mercersburg, Pa. , From 1839 To 1845

By Theodore Appel

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The Beginnings Of The Theological Seminary Of The Reformed Church In The United States

By Theodore Appel

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In this painfully honest study, Appel describes the trials behind the early stages and the eventual success of the Theological Seminary of the Reformed Church in the United States. The first theolo...

Life And Work Of John Williamson Nevin

By Theodore Appel, CrossReach Publications

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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.