Trevor Todd Books

PM Chapter Book Progress with Meaning

By Trevor Todd

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PM Chapter Book Progress with Meaning

By Trevor Todd

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Racing Driver s Moustache

By Stephen Abelsen, Trevor Todd

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The cockroach that wrote a symphony

By Trevor Todd

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"Listen, kid, a toe's a toe, a knee's a knee, and an elbow's an elbow. You can't copyright nature!" Or can you? Justin has a talent for art and a very big toe. With a little help from Becky, that's...

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.