1. Nisbet, R.: Knowledge dethroned. The New York Times Magazine: September 28, 1975, p. 34
2. Cassidy, H. G.: Knowledge, Experience and Action: An Essay on Education. New York: Teachers College Press, Columbia Univ., 1962
3. Cassidy, H. G.: Scientific thought: A force in human life. Am. Scientist 58, 476 (1970)
4. Snow, C. P.: The Two Cultures: and a Second Look. London: Cambridge Univ. Press, 1963
5. Holton, G.: Mainsprings of scientific discovery. In: The Nature of Scientific Discovery. Gingerich, O. (ed.). Washington, D.C.: Smithsonian Inst. Press, 1975