Tony Perrottet Books

Sex and travel have always been intertwined, and never more so than on the classic Grand Tour of Europe in the eighteenth and nineteenth centuries. Today the Continent is still littered with salaci...

Pagan Holiday

By Tony Perrottet

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The ancient Romans were responsible for many remarkable achievements—Roman numerals, straight roads—but one of their lesser-known contributions was the creation of the tourist industry. The first p...

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.