I recently read a book titled Introducing Happiness: A Practical Guide, which is available as part of the Amazon 12 Days of Kindle ebooks sale.
It was one of the better books on happiness that I have read, and provides a good overview of some of the various approaches to attaining happiness. From the likes of Aristotle, on to the Buddha, and finishing up with modern happiness luminaries such as Martin Seligman, Introducing Happiness: A Practical Guide was an illuminating, informative and interesting read.
Of particular interest were the sections which covered the Stoic, Daoist (in particular Zhuangzi), Buddhist and Epicurean philosophies.
Well worth the 99p.