1. Binet, A., & Simon, T. Méthodes nouvelles pour le diagnostic du niveau intellectuel des anormaux.Année Psychologique, 1905,11, 191–244.
2. Butcher, J. J. Summary of discussions at the Toronto conference on intelligence. In W. B. Dockrell (Ed.),On intelligence: Contemporary theories and educational implications: A symposium, Toronto, 1969. Toronto: Ontario Institute of Studies in Education, 1970.
3. Chance, M. R. A., & Jolly, C. J.Social groups of monkeys, apes and men. London: Cape, 1970.
4. Colquhoun, W. P.Biological rhythms and human performance. New York: Academic Press, 1971.
5. Conroy, R. T. W. L., & Mills, J. N.Human circadian rhythms. London: Churchill, 1970.