Sandra Siemens Books

¿Quiénes son los otros? ¿Son tan peligrosos, malos y horribles como cree el rey Froilán? La muralla que protege su reino es ya tan alta y extensa que lo mantiene solo, alajado de todo. ¡Pero aun as...

De Unicornios E Hipogrifos

By Sandra Siemens

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La polilla The Moth La Pluma Del Gato Infantil

By Sandra Siemens

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La Silla De La Izquierda

By Sandra Siemens

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Ay dijo Filiberto

By Sandra Siemens

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Filiberto is afraid of everything. One day he goes to the circus and strange things happen when a magician tries to make him disappear.

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.