Derek Walter Books

The true adventures of Esther the wonder pig

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Esther the Wonder Pig was adopted as a teacup pig, but her dads Steve and Derek quickly find that she's actually a full-size pig who is far too big for their little apartment, so the family expands...

Learning MIT App Inventor: A Hands-On Guide to Building Your Own Android Apps

By Derek Walter

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Feng Shui Handbook

By Derek Walter

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Happily ever Esther

By Steve Jenkins

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Steve Jenkins and Derek Walter, had their lives turned upside down when they adopted their pig-daughter Esther--the so-called micro pig who turned out to be a full-sized commercial pig growing to a...

Esther una cerdita maravillosa

By Steve Jenkins

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En el verano de 2012, una vieja amiga se puso en contacto con Steve Jenkins y le ofreció adoptar un minicerdo. Aunque sabía que a su pareja, Derek, no le entusiasmaría la idea, accedió a quedarse c...

Happily Ever Esther

By Derek Walter, Steve Jenkins, Caprice Crane

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Learning MIT App Inventor

By Mark Sherman, Derek Walter

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Learning MIT App Inventor

By Mark Sherman, Derek Walter

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True Adventures of Esther the Wonder Pig

By Cori Doerrfeld, Derek Walter, Steve Jenkins, Caprice Crane

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True Adventures of Esther the Wonder Pig

By Cori Doerrfeld, Derek Walter, Steve Jenkins, Caprice Crane

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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.