Douglas TenNapel Books

Mighty Monday madness

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Weird things happen in Mrs. Frightenright's class on Monday mornings! How about werewolves, talking spiders, man-eating aliens, and a pig that plays backgammon?

Tuna Fish Tuesday (Strange Kid Chronicles)

By Doug Tennapel

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Weird things happen in Mrs. Frightenright's class on Tuesday morning! How about giant ants, a kid who is constantly picking his nose, and Clockboy the mechanical mystery?

Wisenheimer Wednesday Strange Kid Chronicles

By Doug Tennapel

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Just Thursday

By Doug Tennapel, Douglas TenNapel

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Weird things happen in Mrs. Frightenright's class on Thursday morning! However, that nasty principal Prickly-Pear is up to something, and you can bet that something is not a good thing.

Fateful Friday Strange Kid Chronicles

By Doug Tennapel

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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.