1. Bauer, R. A. (Ed.). (1966). Social indicators. Cambridge: MIT Press.
2. Bell, D. (1969). Toward a social report. The Public Interest, 15, 72–84.
3. Campbell, A., Converse, P., & Rodgers, W. (1976). The quality of American life: Perceptions, evaluations and satisfactions. New York: Russell Sage.
4. Drenowski, J., & Scott, W. (1966). The level of living index. Geneva: United Nations Research Institute for Social Development.
5. Estes, R. J. (1984). The social progress of nations. New York: Praeger.