John Passarella Books

Ghoul Trouble

By John Passarella

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Grimm: The Chopping Block

By John Passarella

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A cache of bones is found in a shallow grave in local woods... Meanwhile missing persons cases in Portland seem to be on the increase. As more bones are discovered, Portland homicide Detective Nick...

Halloween: The Official Movie Novelization

By John Passarella

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The official novelization of the highly anticipated revamp of the classic horror film Halloween.In 1978, Laurie Strode survived an encounter with Michael Myers, a masked figure who killed her frien...

Malefices

By David Greenwalt, John Passarella, Joss Whedon

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Shimmer

By John Passarella

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Ghoul Trouble

By John Passarella

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Grimm: The Chopping Block

By John Passarella

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Supernatural: Night Terror

By John Passarella

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Alerted to strange happenings in Clayton Falls, Colorado, Bobby sends the boys to check it out. A speeding car with no driver, a homeless man pursued by a massive Gila monster, a little boy chased...

Halloween: The Official Movie Novelization

By John Passarella

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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.