Ari Marmell Books

The sinister spire

By Bruce R. Cordell, Ari Marmell

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Shades of Grey Wizards of the Coast Discovery Novels

By Ari Marmell

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Tomb of Horrors

By Ari Marmell

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"Tomb of Horrors is a far-reaching Dungeons & dragons adventure that takes characters from 10th level to 22nd level, with natural break periods for other adventures. It includes background materia...

Writing Fantasy Heroes

By Brandon Sanderson, Glen Cook, Ari Marmell, Paul Kearney, Ian C. Esslemont, Orson Scott Card, Jennifer Brozek

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Shock Totem 5

By K. Allen Wood, Joe Mirabello, Darrell Schweitzer, Sean Eads, Ari Marmell, Jack Ketchum, Shock Totem, Kurt Newton, Mekenzie Larsen, Jaelithe Ingold

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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.