Richard A. Knaak Books

"For more than sixteen hundred years, Nick Medea has followed and guarded the Gate that keeps the mortal realm and that of Feirie separate, seeking in vain absolution for the fatal errors he made w...

Black City demon

By Richard A. Knaak

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"Since he became the guardian of the Gate between our world and Feirie sixteen hundred years ago, Nick Medea, once Saint George, has battled to keep the darkest Feirie--the Wyld--from invading the...

Black City Demon

By Richard A. Knaak

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King of the Grey City of Shadows Book One

By Richard A. Knaak

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338 pages ; 21 cm

Legends of the Dragonrealm

By Richard A. Knaak

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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.