John Hartness Books

Year One A Quincy Harker Demon Hunter Collection

By John G. Hartness

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We are not this

By Jay Requard, John Hartness, Melissa Gilbert

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"Over two dozen writers from North Carolina or with deep ties to the Tarheel State band together to raise money for LGBTQ charities in Charlotte and North Carolina as a response to the NC General A...

The Black Knight Chronicles

By John Hartness

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Paint it Black

By John G. Hartness

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Man in Black The Black Knight Chronicles Book 6

By John G. Hartness

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The Cambion Cycle Quincy Harker Year Two

By John G Hartness

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Damnation

By John G. Hartness

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Queen of Kats

By John G. Hartness

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Chosen

By John G. Hartness

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Hard Day s Knight

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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.