Gregory David Books

Dinner with a Perfect Stranger: An Invitation Worth Considering

By David Gregory, Gregory David

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Dinner with a perfect stranger

By Gregory David

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Cena Con Un Perfecto Desconocido

By Gregory David

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Mendocino

By Gregory David

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The Last Christian

By David Gregory

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In the future, it’s possible to live forever—but at what cost? A.D. 2088.  Christian missionary Abigail Caldwell emerges from the jungle for the first time in her thirty-four...

Mendocino

By Gregory David

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The last Christian

By Gregory David

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Breaking free from hepatitis C

By Gregory David

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Breaking free from hepatitis C

By Gregory David

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Breaking free from hepatitis C

By Gregory David

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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.