##1. Android:
##2. iOS:
- [Coding Guidelines for Cocoa] (https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html#//apple_ref/doc/uid/10000146-SW1)
- [Programming with Objective-C] (https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html#//apple_ref/doc/uid/TP40011210-CH1-SW1)
- iOS Human Interface Guidelines
- View Programming Guide for iOS
- Auto Layout Guide
- View Controller Programming Guide for iOS