Nancy E. Krulik Books

Mary Kate and Ashley

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The twins find another mystery on their hands when they visit the New York City Ballet and learn that the star ballerina's diamond tiara has been stolen.

The Magic Schoolbus Goes Upstream

By Nancy E. Krulik

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Curious George Makes a Splash Picture Puzzle Book Picture Puzzle Book

By Nancy E. Krulik

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The Rescue Free Willy

By Scholastic Books

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The Magic School Bus In A Pickle

By Nancy E. Krulik, Mary Pope Osborne

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Magic School Bus TV Tie-In

Mulan saves the day

By Nancy E. Krulik

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The retelling of a Chinese poem in which a young girl masquerades as a boy and fights the Huns.

Curious George Saves the Day

By Nancy E. Krulik

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Real Robots

By Nancy E. Krulik, Ira D. Epstein

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Kissyfur

By Nancy E. Krulik

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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.