Tohby Riddle Books

Dog and Bird Follow a Butterfly

By Tohby Riddle

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Dog and Bird Water the Garden

By Tohby Riddle

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[22] p. :

Word Spy

By Ursula Dubosarsky, Tohby Riddle

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Pink Freud

By Tohby Riddle

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A collection of cartoons about life's big issues and little issues. In turns humorous, whimsical, political and philosophical, these sketches and cartoons by award-winning author/illustrator Tohby...

Return of the Word Spy B and W

By Ursula Dubosarsky, Tohby Riddle

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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.