Greg M Perry Books

The three leading open source alternatives to Microsoft Office, Internet Explorer and Outlook are OpenOffice.org, Firefox and Thunderbird. If you are looking to make the migration to these open sou...

Sams Teach Yourself Microsoft Windows Vista All in One Sams Teach Yourself

By Greg Perry

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Sams Teach Yourself Microsoft R Office 2007 All in One Sams Teach Yourself

By Greg M. Perry, Greg Perry

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HTML 4.01 Weekend Crash Course

By Greg M Perry, Greg Perry

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The Weekend Crash Course series consists of 30 sessions over a period of three days. Each session is designed to take 30 minutes to complete, so the Crash Course is an intense 15-hour learning peri...

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.