Nancy E. Krulik Books

Gotcha! Gotcha Back!

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When the magic wind turns fourth-grader Katie into her friend George, who has been playing practical jokes to liven up their school, she has to figure out how to get him out of trouble and sooth ev...

A Katie Kazoo Christmas

By Nancy E. Krulik

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Katie can’t wait for the holidays. There are so many things to look forward to! Her motorcycle-riding grandma is coming to visit, class 4A is having a Secret Santa grab bag, and it’s almost time fo...

Katie Kazoo Switcheroo Keepsake Box Katie Kazoo Switcheroo

By Nancy E. Krulik

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Be Nice to Mice

By Nancy E. Krulik

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Fourth-grader Katie is concerned when an older girl uses live mice in a science fair project, but when Katie turns into the sixth-grader and has to run the experiment herself, she has a different o...

I'm Game 21

By Nancy E. Krulik

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Katie magically turns into her father right before he is set to appear on his favorite television game show, but unfortunately she cannot answer a single question.

Anyone But Me 1 promo Katie Kazoo Switcheroo

By Nancy E. Krulik

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Witch Switch

By Nancy E. Krulik

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Katie loves Halloween. Everyone is buzzing about the costume contest, the Halloween parade is just around the corner, and a mysterious black kitten has captured Katie’s attention. But the busy holi...

It's Snow Joke

By Nancy E. Krulik

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While spending winter break at a ski lodge, beginning-skier Katie finds herself in some very complicated situations when the magic wind turns her into the ski instructor.

Open Wide

By Nancy E. Krulik

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Chaos reigns when the magic wind turns fourth-grader Katie into Dr. Sang the dentist, and she must examine the mouth of a fearful new patient.

No biz like show biz

By Nancy E. Krulik

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Thanks to the magic wind, when the unassuming Miriam (instead of the smug Suzanne) gets the leading role in the school play, Katie soon finds herself on stage, trying to sing and remember her lines...

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.