Charles Keller Books

Giggle Puss: Pet Jokes for Kids

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The Nutty Joke Book

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A collection of jokes about peanuts and nuts.

School daze

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A collection of jokes and riddles about school.

Waiter, There's a Fly in My Soup! Restaurant Jokes

By Charles Keller, Keller Undifferentiated

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A collection of jokes about waiters and their customers.

Count Draculations Monster Riddles

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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.