Johnny O Brien Books

Day of the Assassins

By Johnny O Brien Illustrated By Nick Hardcastle

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The year: 1914The place: Sarajevo The mission: the assassination of Archduke Franz FerdinandJack Christie and his best friend, Angus, find themselves at the center of a momentous event that wi...

Semisweet

By Johnny O Brien

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Day of Rebellion

By Johnny O Brien

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Day of vengeance

By Johnny O Brien

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Teenage time-traveller Jack Christie is back, this time with a mission to stop World War Two from going nuclear. Jack travels to a crucial turning point in history where the Nazis threaten world do...

Day of Deliverence

By Johnny O Brien

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Day of rebellion

By Johnny O Brien

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When Jack Christie's father disappears, the time-travelling teenager and his best friend Angus track him to a strange icebound future where China has evolved into a global superpower. Time has spli...

The Estate

By Johnny O Brien

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Jack Christie Serisi 4 Kitap Takim Kutulu

By Johnny O Brien

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Jack Christie Intikam Gunu

By Johnny O Brien

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Jack Christie Isyan Gunu

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.