1. Allardt, E. (1973). About dimensions of welfare, Research group for Comparative Sociology, Research Report No. 1, University of Helsinki, 1973
2. Causes and correlates of happiness;Argyle,1999
3. Changing popular attitudes toward progress;Barnes,1982
4. Blanchflower, D. G., & Oswald, A. (1998). Unemployment, well-being and wage curves in Eastern Europe, Mimeo., Dartmouth College and University of Warwick
5. Blanchflower, D. G., & Oswald, A. (2000). Well-being over time in Britain and the USA, NBER Working Paper 7487