I don't know why the author recommended a book on Haskell, ruby, php, and python/django but did not recommend a single book on ux/ui. I would rather he included

I don't know why the author recommended a book on Haskell, ruby, php, and python/django but did not recommend a single book on ux/ui. I would rather he included a couple books on ux/ui like "Dont' make me think" by Steve Krug .