Sandra Markle Books

Super science secrets

By Sandra Markle

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Toad weather

By Sandra Markle

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There's nothing to do on a rainy day so Ally thinks. But Mama says she's seen something amazing, so despite Ally's misgivings, she sets out on an adventure with her mother and grandmother. On her j...

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.

A Mother's Journey

By Sandra Markle Author Alan Marks Illustrator

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Acclaimed nonfiction author Sandra Markle presents the daring story of a mother emperor penguin's struggle to reach the sea, find food, avoid predators, and make her way back to her mate and their...

A Mother's Journey

By Sandra Markle Author Alan Marks Illustrator

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Acclaimed nonfiction author Sandra Markle presents the daring story of a mother emperor penguin's struggle to reach the sea, find food, avoid predators, and make her way back to her mate and their...

Crocodiles Animal Predators

By Sandra Markle

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Lions Animal Predators

By Sandra Markle

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Killer whales

By Sandra Markle

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Presents information on the physical characteristics, life cycle, and behavior of killer whales, with an emphasis on how they hunt.

Owls Animal Predators

By Sandra Markle

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Polar Bears Animal Predators

By Sandra Markle

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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.