Katy S. Duffield Books

Poltergeists Mysterious Encounters

By Katy Duffield

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Aliens Get the Sniffles Too! Ahhh-Choo!

By Katy S. Duffield Illustrated By K. G. Campbell

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Ahhh-flying-saucer-shooting-star-CHOO! Laughter is the best medicine when you’re a little alien feeling under the weather.Little Alien is sick. And sick is extra-terrestrial bad when you have...

Farmer McPeepers and his missing milk cows

By Katy Duffield

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A crafty herd of cows borrows Farmer McPeepers' eyeglasses so that they can have a day on the town.

Farmer McPeppers and His Missing Cows

By Katy S. Duffield

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Crossings

By Katy S. Duffield, Mike Orodan

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Chad Hurley Steve Chen Jawed Karim

By Katy S. Duffield

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Ken Kutaragi

By Katy S. Duffield

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Bermuda Triangle

By Katy S. Duffield

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Ken Kutaragi

By Katy Duffield, Katy S. Duffield

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Chad Hurley Steve Chen Jawed Karim

By Katy Duffield

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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.