Rory Lewis Books

IPhone and iPad Apps for Absolute Beginners
IPhone and iPad Apps for Absolute Beginners
IPhone and iPad apps for absolute beginners
IPhone and iPad apps for absolute beginners

By Rory Lewis

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So how do you build an application for the iPhone and iPad? Don't you need to spend years learning complicated programming languages? What about Objective-C and Cocoa touch? The answer is that you...

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IPhone and iPad Apps for Absolute Beginners
IPhone and iPad Apps for Absolute Beginners Fourth Edition
Desarrollo de aplicaciones para iPhone iPad sobre iOS 5
Portraitist
Portraitist

By Rory Lewis

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Portraitist
Portraitist

By Rory Lewis

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Portraitist
Portraitist

By Rory Lewis

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Portraitist
Portraitist

By Rory Lewis

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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.

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