1. BBC. (2006). Britain’s Happiness in Decline.
http://news.bbc.co.uk/2/hi/programmes/happiness_formula/4771908.stm
. Accessed December 5, 2009.
2. Burns, G. W. (2005). Naturally happy, naturally healthy: The role of the natural environment in well-being. In F. A. Huppert, N. Baylis, & B. Keverne (Eds.), The science of well-being (pp. 405–431). Oxford: Oxford University Press.
3. Burns, G. W. (2009). Can we have both psychological and ecological well-being? In K. Ura & D. Penjore (Eds.), Gross national happiness: Practice and measurement (pp. 127–148). Thimphu: Centre for Bhutan Studies.
4. Böhnke, P. (2005). First European quality of life survey: Life satisfaction, happiness and sense of belonging. Luxembourg: Office of Official Publications of the European Communities.
5. Carpenter, R., & Carpenter, B. (2002). The blessings of Bhutan. Honolulu, HI: University of Hawaii Press.