Esthela Calderon Books

Los huesos de mi abuelo

By Esthela Calderon

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Las manos que matan

By Esthela Calderon

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Coyol quebrado

By Esthela Calderon

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Poetry by Nicaraguan author (b. 1970); 1st place winner of the Juegos Florales Centroamericanos Belice y Panamá in 2001.

8 caras de una misma moneda (novela)

By Esthela Calderon

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A historical novel set during the 1980s in wartime Nicaragua by a young, prize-winning national author (León, 1970).

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.