Download Xcode DMG file

http://stackoverflow.com/questions/10335747/how-to-download-xcode-4-5-6-and-get-the-dmg-file

Suppressing deprecated warnings in Xcode

http://stackoverflow.com/questions/2622017/suppressing-deprecated-warnings-in-xcode

Add Framework in XCode

http://www.peachpit.com/articles/article.aspx?p=1830485

xcode tutorial

http://www.youtube.com/user/vtkurup/videos?sort=dd&flow=list&page=1&view=0

Xcode 4 User Guide

http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Conceptual/Xcode4UserGuide/Introduction/Introduction.html

Xcode Quick Start Guide

http://developer.apple.com/library/ios/#documentation/IDEs/Conceptual/xcode_quick_start/000-About_Xcode/introduction.html