7Havighurst R J. Tobin S S. The measurement of life satisfaction. Journal of Gerontology, 1961:16:134 - 143
8Carley M. Social measurement and social indicators. Issues of Policy and Theory, 1981:34- 40
9Diener R. Emmons R. A. larsen R. J. et al. The satisfaction with life scale. Journal of personality assessment, 1985:49(1) :71 - 75
10Kozma A. Stones M J. The measurement of happiness:development of the memorial university Newfoundland scale of happiness. Journal of Gerontology, 1980: 35 (6): 906 -917
