John O Sullivan Books

Understanding technical graphics workbook

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Written for Junior Certificate students taking either Higher or Ordinary Level. Refreshing in its use of colour, examples and approach to topics, this book balances text and graphics. Covering the...

Natural Treatment for Schizophrenia

By John O Sullivan

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Champion Sports Parent

By Jerry Lynch, John O Sullivan

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Commentary on the Book of Psalms

By Saint Robert Bellarmine, John O Sullivan, St Athanasius St Athanasius Press

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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.