Keller John Esten. Books

Daily life depicted in the Cantigas de Santa Maria

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The hundreds of illuminated miniatures found in the Cantigas de Santa Maria, centered around the miracles of the Virgin Mary and sponsored by King Alfonso X (1252-84), reveal many vistas of daily l...

Collectanea Hispanica

By Keller John Esten.

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Iconography in medieval Spanish literature

By Keller John Esten.

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Narraciones breves piadosas versificadas en el castellano y gallego del medievo

By Keller John Esten.

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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.