John Westfall Books

Coloring Outside the Lines: Discipleship for the Undisciplined

By John Westfall

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Celestial Shadows

By William Sheehan, John Westfall

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Much of what is known about the universe comes from the study of celestial shadows—eclipses, transits, and occultations. The most dramatic are total eclipses of the Sun, which constitute one of th...

Celestial Shadows

By William Sheehan, John Westfall

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The Transits of Venus

By William Sheehan, John Westfall

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"If you are interested in observing a sight not witnessed by humankind for over 120 years, you'd better consult this book. One June 8, the planet Venus will appear to traverse the face of the sun f...

Getting past what you ll never get over

By John Westfall

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Celestial Shadows

By William Sheehan, John Westfall

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Building Strong People

By Bobbie Reed, John Westfall

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Transits of Venus

By William Sheehan, John Westfall

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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.