Randy Michael Testa Books

After the fire

By Randy Michael Testa

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In the valley of the shadow

By Randy Michael Testa

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This compassionate examination of the dilemmas facing the Amish and Mennonite communities in Lancaster County, Pennsylvania focuses on the controversy surrounding construction of a 600-unit retirem...

After the Fire

By Susie Riehl, Randy Michael Testa, John A. Hostetler, Robert Coles

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Life in Medicine

By Randy Michael Testa, Robert Coles

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Life in Medicine

By Joseph D Donnell, Penny Armstrong, Randy Michael Testa, Robert Coles, M. Brownell Anderson

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In the Valley of the Shadow

By Randy Michael Testa, Ed Worteck

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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.