英文版
Zen and the Art of the Objective-C Craftsmanship
https://github.com/objc-zen/objc-zen-book
中文版
禅与 Objective-C 编程艺术
https://github.com/oa414/objc-zen-book-cn
PDF、mobi、epub版
GitBook for 《禅与 Objective-C 编程艺术》
https://www.gitbook.com/book/yourtion/objc-zen-book-cn/details
禅与 Objective-C 编程艺术（Zen and the Art of the Objective-C Craftsmanship）
原文：http://www.cnblogs.com/mobilefeng/p/4847443.html