Peter Duffy Books

Youth and Theatre of the Oppressed

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Youth and Theatre of the Oppressed investigates a performance strategy which aims to develop possible alternatives to oppressive forces in individual’s lives. Eminent contributors offer diverse per...

Double agent

By Peter Duffy

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An account of a virtually unknown pre-World War II counterespionage operation describes how naturalized German-American agent William G. Sebold became the FBI's first double agent and was a pivotal...

Brat?ia Bel?skie

By Peter Duffy

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Les freres Bielski

By Peter Duffy

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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.