Justin Gustainis Books

Hard spell

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"Stan Markowski is a Detective Sergeant on the Scranton PD's Supernatural Crimes Investigation Unit. Like the rest of America, Scranton's got an uneasy 'live and let unlive' relationship with the s...

Evil Dark An Occult Crimes Unit Investigation

By Justin Gustainis

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Evil Dark

By Justin Gustainis

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My name's Markowski. I carry a badge. Also, a crucifix, some wooden stakes, a big vial of holy water, and a 9mm Beretta loaded with silver bullets.A series of seemingly motiveless murders of supern...

Known devil

By Justin Gustainis

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My name's Markowski. I carry a badge. Also, a crucifix, some wooden stakes, a big vial of holy water, and a 9mm Beretta loaded with silver bullets. A new supernatural gang is intent on invading Scr...

Shroud 10

By Rio Youers, Danny Evarts, Justin Gustainis, Timothy Deal, Thomas Phillips, Kelli Owen, Alethea Kontis, Norman Partridge, Kevin Lucia, Lisa Mannetti

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Black magic woman

By Justin Gustainis

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Black magic woman

By Justin Gustainis

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Sympathy for the devil

By Justin Gustainis

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Hard Spell: An Occult Crimes Unit Investigation - Angry Robot Paperback

By Justin Gustainis

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Hard Spell

By Justin Gustainis

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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.