Martha Mutz Books

Los Tres Chivitos Gruff the Three Billy Goats Gruff

By Peter Christen Asbjornsen, Martha Mutz

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Presents a play adaptation of the Norwegian tale about three clever goats and a nasty troll.

El Hombrecito De Pan Jengibre the Gingerbread Man

By Martha Mutz

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A play in Spanish and English, based on the folktale about a freshly baked gingerbread man who escapes when he is taken out of the oven and eludes a number of animals until he meets a clever fox.

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.