Siddhartha, by Herman Hesse is a big one. Ecclesiastes is also excellent, and you shouldn't shy away just because it's in the Bible.
_Siddhartha_ is my mother's favorite book. I find that Buddhist and Stoic philosophy deal with many of the same subjects, specifically, gaining peace with the trials of life. I, however, prefer the Stoic's emphasis on discipline and perseverance over the Buddhist's emphasis on acceptance and understanding. I don't think that one is qualitatively superior to the other, it is just that Stoicism works better for me.