Happiness by Dan Haybron (Stanford Encyclopedia of Philosophy)
Oxford Handbook of Happiness edited by Susan David, Ilona Boniwell, and Amanda Conley Ayers
The Philosophy of Well-Being: An Introduction by Guy Fletcher
The Routledge Handbook of Philosophy of Well-Being edited by Guy Fletcher
Well-Being by Ben Bradley
Well-Being by Roger Crisp (Stanford Encyclopedia of Philosophy)
World Database of Happiness: An Archive of Research Findings on Subjective Enjoyment of Life