Referência de tempo de execução Objective-C

Referência
https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html

Guia de Programação
https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Introduction/Introduction.html

Tradução para coreano
http://nol2soft.wordpress.com/category/ios-development/objective-c-runtime-programming-guide/

PDF
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/ObjCRuntimeGuide.pdf