1. BOULDING, K.E.,The image. Ann Arbor: University of Michigan, 1956.
2. BRACHT, G.H. Experimental factors related to aptitude-treatment interactions.Review of Educational Research, 1970,40, 627–647.
3. DUNKIN, M., & BIDDLE, B.The study of teaching. New York: Holt, Rinehart & Winston, 1974.
4. COHEN, J., & COHEN, P.Applied multiple regression/correlation analysis for the behavioral sciences. New York: John Wiley, 1975.
5. CONGALTON, A.A.Status and prestige in Australia Melbourne: Cheshire, 1969.