John Marco Books

The Jackal of Nar Tyrants Kings

By John Marco

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The eyes of God

By John Marco

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The young king of Liiria, Akeela the Good, and his champion Lukien, The Bronze Knight, offer a peaceful end to a long and bloody war with their ancient enemy, the Reec. Taking a Reecian princess a...

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.

John Marco Books

The Eyes of God

The Devil s Armour Gollancz

The Devil s Armour Gollancz

The Devil s Armour Gollancz

The Sword of angels

Sword of Angels

The Jackal of Nar Tyrants Kings

Gumbles in Trouble

The eyes of God

The eyes of God

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