J. R. Castle Books

The flame dragon

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Twelve years ago, on the Islands of Alariss, General Vayn gained power in a military coup after the emperor and empress had "a tragic accident". The Dragon Knights, an elite force loyal to the empe...

The shadow dragon

By J. R. Castle

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Quinn, Thea and Ignus the Flame Dragon travel to the remote and misty Keriss Island to seek his destiny. The Black Guard and their allies are on their heels when they meet Ulric, another Dragon Kni...

Silver and Light

By J. R. Castle, Jackie Castle

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Storm Dragon

By J. M. Masters

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Flame Dragon

By J. R. Castle

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Shadow Dragon

By J. R. Castle

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Radiance

By Jackie Castle

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Blood and Water

By J. Castle

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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.

J. R. Castle Books

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

What is an EAN and How Does it Relate to an ISBN?