Paul Kunkel Books

Good Owners, Great Dogs

By Paul Kunkel, Brian Kilcommons

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How to toilet train your cat

By Paul Kunkel

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"Here in a 25th anniversary edition is the book that the two-billion-dollar-a-year kitty litter industry doesn't want you to read! Why? Because they know what would happen if 86 million cat owners...

Exploring precalculus with the Geometer s sketchpad

By Daniel Scher

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Allows students to directly experience, through dynamic visualization and manipulation, the topics covered in precalculus.

Exploring algebra 1 with the geometer s sketchpad

By Paul Kunkel

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Exploring algebra 2 with the Geometer s Sketchpad

By Paul Kunkel

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Digital Dreams. The Work of the Sony Design Center.

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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.