John McKenna Books

Natural Alternatives to Antibiotics

By John McKenna

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Antibiotics

By McKenna John Medical Doctor

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This title contains citations from medical journals stressing the importance of not using antibiotics in the treatments of specific conditions, especially in children. It also discusses the negativ...

Good food

By McKenna John Medical Doctor

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In Good Food, John McKenna starts with his personal experience of good, healthy food, growing up in the Irish countryside. From there he develops his experiences as a doctor in West Africa, encount...

Natural alternatives to antibiotics

By McKenna John Dr.

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Over mountains mountains

By John McKenna

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Rural beach management

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The State v Relihan & other poems

By John McKenna

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The Essential Guide to Vaccinating Your Child

By John McKenna

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The Burning Green

By John McKenna, Nancy McKenna

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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.