Mark Douglas Norman Books

Strange suckers

By Mark Douglas Norman

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The penguin book

By Mark Douglas Norman

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Funny faces

By Mark Douglas Norman

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The faces of some animals may look funny to us but their eyes, ears, noses and mouths are exactly what those animals need to survive. Find out "Why the funny face?"

A Guide to Squid Cuttlefish and Octopuses of Australasia

By Amanda Reid, Mark Douglas Norman, Mark Norman

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Guide to Squid Cuttlefish and Octopuses of Australasia

By Amanda A. Reid, Mark M. Norman

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Into The Deep. Life Through the depths of the ocean

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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.