From C++ to Objective-C
http://pierre.chachatelier.fr/programmation/fichiers/cpp-objc-en.pdf

http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/OOP_ObjC/

http://developer.apple.com/library/ios/#referencelibrary/GettingStarted/Learning_Objective-C_A_Primer/_index.html#//apple_ref/doc/uid/TP40007594

http://developer.apple.com/library/ios/navigation/