Heloisa Paulo Books

Norton de Matos e as eleicoes presidenciais de 1949 60 anos depois

By Heloisa Paulo, Helena Pinto Janeiro

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Aqui tambem e Portugal

By Heloisa Paulo

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Memorias das oposicoes

By Heloisa Paulo

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Estado Novo e propaganda em Portugal e no Brasil

By Heloisa Paulo

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"Compact, well-researched comparison of activities of propaganda agencies of Estado Novo of Salazar in Portugal and Vargas in Brazil, with some discussion of their cooperative projects. Based prima...

Migracoes e Exilios no Mundo Contemporaneo

By Heloisa Paulo, Cristina Climaco, Enrique Coraza De Los Santos, Alberto Pena Rodriguez

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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.