Objective-C

http://ganesia.com/
http://belajar-ios.blogspot.com/2013/05/objective-c.html
http://macclubindonesia.com/forums/forum/mac-club-forums/developer-mac/68448-ios-dev-objective-c-beginner-s-guide
http://codewithchris.com/first-xcode-project/
http://tryobjectivec.codeschool.com/
http://www.binpress.com/tutorial/learn-objectivec-in-24-days/38
http://blog.teamtreehouse.com/the-beginners-guide-to-objective-c-language-and-variables
http://teamtreehouse.com/library/objectivec-basics
http://code.tutsplus.com/categories/objective-c?page=4