1. Anderson, J. E., Dynamics of development: Systems in process. In D. B. Harris (Ed.), The concept of development. Minneapolis: University of Minnesota Press, 1957, 25–48.
2. Barker, R. G., & Wright, H. F. Midwest and its children. Evanston, Ill.: Row, Peterson, 1954.
3. Erikson, E. H. Identity and the life cycle. New York: International University Press, 1959.
4. Flavell, J. H., & Draguns, J. A microgenetic approach to percep-tion and thought. Psychol. Bull., 1957, 54, 197–217.
5. Fraisse, P. The psychology of time. New York: Harper & Row, 1963.