Jonathan Tweet Books

The Players Survival Guide

By Jonathan Tweet

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Rivals of Esthedil Primal Order

By Jonathan Tweet

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13th Age Glorantha

By Jonathan Tweet, Rob Heinsoo

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Roleplaying in Glorantha for the 13th Age rules system.

EVERWAY Silver Anniversary Edition - Book 1: Players

By Jonathan Tweet, Richard Rowan, Jesse McGatha

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EVERWAY Silver Anniversary Edition - Book 1: Players is the primary book of the EVERWAY roleplaying game system. You play as fantasy heroes of myths and legends, discover your hero's story from ric...

13th Age RPG

By Jonathan Tweet

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13th Age is the highly-anticipated new rules-light fantasy RPG from two legendary game designers - Jonathan Tweet and Rob Heinso of Dungeons & Dragons fame, combining an old-school approach with in...

Dungeons & dragons: Manuel des monstres, livre de regles, III v.3.5

By Jonathan Tweet, Skip Williams, Monte Cook

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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.