Cathy Hapka Books

How Not to Babysit Your Brother Step Into Reading A Step 4 Book Paperback

By Ellen Titlebaum, Cathy Hapka

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Curious George s Dinosaur Discovery Curious George

By H. A. Rey, Cathy Hapka

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Supernova Star Power Simon Schuster

By Cathy Hapka

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Igor

By Cathy Hapka

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In the land of Malaria, where it is always dark and dreary, a hunchbacked lab assistant holds out hope that he can one day fulfill his dream of becoming a scientist, although an Evil Scientist, by...

Something borrowed

By Cathy Hapka

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Ava "borrows" her friend's boyfriend for a special occasion.

Oasis Dinotopia Paperback Bullseye Books

By Cathy Hapka

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Supernova

By Cathy Hapka

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Fourteen-year-old Star Calloway is the most famous pop star in the world. The only thing which makes her unhappy is that her parents and brother are missing.

At first sight

By Cathy Hapka

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Lauren and Riley first meet under the stars and instantly know they are destined to be together. Okay, so maybe it's on a lame school trip to the planetarium, and maybe they don't get each other's...

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.