Cristina Sousa Books

Basic Portuguese

By Maria Cristina Marques Dos Santos Sousa

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"Basic Portuguese: A Grammar and Workbook comprises an accessible reference grammar and related exercises in a single volume. Eighteen units covering the core material which students would expect t...

Basic Portuguese

By Maria Cristina Marques Dos Santos Sousa

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Intermediate Portuguese

By Cristina Sousa

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Intermediate Portuguese

By Cristina Sousa

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Intermediate Portuguese

By Cristina Sousa

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Intermediate Portuguese

By Cristina Sousa

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Portuguese An Essential Grammar

By Amelia P. Hutchinson, Janet Lloyd

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Portuguese

By Cristina Sousa, Amelia P. Hutchinson, Janet Lloyd

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Portuguese

By Cristina Sousa, Amelia P. Hutchinson, Janet Lloyd

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Portuguese

By Cristina Sousa, Amelia P. Hutchinson, Janet Lloyd

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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.