Campbell, D. T., & Russo, M. J. (1999). Social experimentation. Thousand Oaks, CA: Sage.
2.
Cronbach, L. J. (1983) Designing evaluations of educational and social programs. San Francisco, CA: Jossey-Bass.
3.
House, E. R. (1973). The conscience of educational evaluation. In E. R. House (Ed.), School evaluation: The politics and process (pp. 125-136). Berkeley, CA: McCutchan.
4.
Mills, C. W. (1959). The sociological imagination. Oxford, UK: Oxford University Press.