Marta Arroyo Books

Jorge and the Lost Cookie Jar

By Penny Weber, Marta Arroyo

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El cuento de la Senora Tamales

By Marta Arroyo

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This is a story about a little hare named Concha, but whom everyone called Senora Tamales because of her delicious food, especially tamales.

Polvorones

By Isa Medina, Marta Arroyo

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Story of Senora Tamales

By Marsha Hawes, Marta Arroyo

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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.