Sandra Markle Books

Smart About Chocolate

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Our unique, kid-friendly Smart About series continues with something for your sweet tooth! Smart About Chocolate is "chock-full" of fun facts about the history of chocolate, from the Mayans to Milt...

Smart About Chocolate GB

By Sandra Markle

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Family Science

By Sandra Markle

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A rainy day

By Sandra Markle

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Examines simple scientific concepts by observing the effect of raindrops on puddles, the sky, animals, and the surrounding landscape on a rainy day.

A rainy day

By Sandra Markle

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Examines simple scientific concepts by observing the effect of raindrops on puddles, the sky, animals, and the surrounding landscape on a rainy day.

Animals Christopher Columbus saw

By Sandra Markle

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Christopher Columbus set out on the journey that would make him famous, and take him to the New World. He and his crew were the first Europeans to see the astounding variety of wildlife in the part...

The fledglings

By Sandra Markle

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Orphaned after the death of her mother, fourteen-year-old Kate runs away to live with her grandfather, a Cherokee Indian who is trying to stop the poaching of predator birds.

Outside and Inside Snakes

By Sandra Markle

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A teaching guide for Desert giant

By Sandra Markle

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How Landforms Change

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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.