Catherine A. Hapka Books

How not to run for class president

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Looking for a fun, light introduction to the campaign process? Join the brothers from the How Not to . . . series as they navigate a class election! Third grader Will couldn t care less about borin...

How not to run for class president

By Cathy Hapka

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"Third-grader Will's little brother Steve enthusiastically manages Will's campaign for class president, despite Will's total lack of interest in running"--

How to Start Kindergarten

By Catherine A. Hapka Illustrated By Debbie Palen

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A hilarious Step 2 reader about starting at a new school!David is the new kid at school, and is worried about fitting in. Steve is NOT worried about fitting in, and tells David, "Just do what I do...

How to Start Kindergarten

By Ellen Titlebaum, Debbie Palen, Catherine A. Hapka, Ellen Vandenberg

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How to Start Kindergarten

By Catherine A. Hapka Illustrated By Debbie Palen

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A hilarious Step 2 reader about starting at a new school!David is the new kid at school, and is worried about fitting in. Steve is NOT worried about fitting in, and tells David, "Just do what I do...

How to Start First Grade

By Catherine A. Hapka Illustrated By Debbie Palen

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It's back to school for Steve! Will his first day of first grade be ruined by the new kid? A hilarious Step 2 reader about self-confidence and friendship!Steve is so excited to start first grade wi...

How to Start First Grade

By Catherine A. Hapka Illustrated By Debbie Palen

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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.