Johnny O Brien Books

Great Irish Legends for Children

By Johnny McMahon, Johnny O Brien

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Dear Johnnies

By Johnny McMahon, Johnny O Brien

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Day of Deliverance

By Nick Hardcastle, Johnny O Brien

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Day of the Assassins

By Nick Hardcastle, Johnny O Brien

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Day of the Assassins

By Johnny O Brien Illustrated By Nick Hardcastle

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"Within the first suspenseful pages, readers will find an engaging historical/science fiction tale that has intrigue, danger, and a little romance. . . . From an explosive escape out of captivity t...

Day of deliverance

By Johnny O Brien

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To thwart their arch-enemy, Pendlesharp, and his misguided notion of changing history, schoolboy Jack Christie and his friend Angus travel back in time to foil a plot to assassinate Elizabeth I, me...

Day of the Assassins

By Johnny O Brien

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Day of Deliverance

By Johnny O Brien

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Semisweet

By Johnny O Brien

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Day of Deliverance

By Johnny O Brien

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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.