Hans Wilhelm Books

Don't give up, Josephine!

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Josephine, a young penguin, is discouraged by her lack of success in school, but discovers that it is better to keep trying than to give up.

It's Too Windy!

By Hans Wilhelm

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The family dog finds a clever way to stop Baby's stroller from rolling away.

I Love Colors!

By Hans Wilhelm

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A playful dog makes a colorful mess when he mixes different colors of paint.

!Hola, Lector! Nivel 1: !No me gusta mi mono!

By Hans Wilhelm

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A little dog laments the fact that the other dogs won't play with him as long as he has a bath, a bow, and a chain.

Se Me Cayo UN Diente I Lost My Tooth Hola Lector

By Hans Wilhelm

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Bunny Trouble rev Bunny Trouble

By Hans Wilhelm

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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.