Christopher Eliopoulos Books

Monster mayhem

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Zoe, a science-obsessed girl finds herself in the middle of one of her favorite monster movies. Can she invent her way out of disaster while also saving the monster who has become her friend?

Cosmic Commandos

By Christopher Eliopoulos

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In this graphic novel adventure for readers of Monster Mayhem and Roller Girl, a pair of twin brothers accidentally bring their favorite video game to life—and now they have to find a way to...

The Yawns Are Coming!

By Christopher Eliopoulos

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Kids will be giggling through their own yawns as they enjoy this contagiously adorable bedtime story by the New York Times bestselling illustrator of the Ordinary People Change the World books.Two...

A Little Emotional

By Christopher Eliopoulos

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Emotions can be unruly, as kids will discover in this funny, conversation-starting book by the bestselling illustrator of Ordinary People Change the World.Tommy’s favorite toy is missing, and...

Cosmic Commandos

By Christopher Eliopoulos

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In this graphic novel adventure for readers of Monster Mayhem and Roller Girl, a pair of twin brothers accidentally bring their favorite video game to life—and now they have to find a way to...

The Imaginoodles

By Christopher Eliopoulos

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While on a playdate with an outgoing new friend, a nervous hedgehog finds the courage to use his imagination, in this lively, funny picture book by the New York Times bestselling illustrator of Ord...

The Giggles Are Coming

By Christopher Eliopoulos

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A couple of friends can't keep from laughing during class on the first day of school, in this companion to The Yawns Are Coming from the illustrator of the Ordinary People Change the World series!T...

The Yawns Are Coming!

By Christopher Eliopoulos

Average: 0.00, 0 Ratings

Kids will be giggling through their own yawns as they enjoy this contagiously adorable bedtime story by the New York Times bestselling illustrator of the Ordinary People Change the World books.Two...

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.