Ralph E. Duffy Books

Introduction To Programming With Visual Basic

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This book provides a complete introduction to the Visual Basic programming language, explaining concepts, and giving extensive 'learn by doing' tutorials. The enclosed disk includes additional Visu...

I/G Microcmptr Applctns

By Harriet L. Capron, Ralph E. Duffy

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Excel 4 For Windows Smart Smart

By Ralph Duffy, Sharel McVey, Ralph E. Duffy, Ralph E. Duffy, Sharel Mcvey

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ix, 278 p. : 24 cm "Based on version 4.0 of Microsoft Excel"--T.p. verso Includes index

Paradox 1.0 For Windows Smartstart

By Duffy Ericksen, Ralph Duffy, Ralph E. Duffy, Ralph Duffy, Linda Ericksen

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x, 241 pages : 23 cm "Based on Paradox for Windows"--Title page verso Includes index

Paradox Smartstart

By Jeffry Byrne, Duffy Byrne, Ralph E. Duffy

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Dbase Iii Plus Smartstart (Smartstart (Oasis Press))

By Ralph Duffy, Ralph E. Duffy

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xviii, 254 p. ; 24 cm Includes index

Excel 5 For Windows Smartstart

By Que Education, Ralph E. Duffy, Preston, John, Matherly, Donna M.

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184 p. : 28 cm Includes index

Visual Basic 4.0 SmartStart

By Que Corporation, Ralph E. Duffy, Que Education &...

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Excel For Windows 95 Smartstart

By Ralph Duffy, Ralph E. Duffy

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Dealing with Excel for Windows, this text is organized so that the reader progresses from simple to complex learning. Each chapter contains tutorials and screen shots.

Using Microcomputers: A Complete Introduction

By H. L. Capron, Ralph E. Duffy, H.L. Capron, Ralph E. Duffy

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Book by Capron, H. L., Duffy, Ralph E.

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.