Kuhlen, R. G., & Thompson, G. G. (1963). Psychological studies of human development (2nd ed.). Appleton-Century-Crofts.

Kuhlen, Raymond G., and George Greene Thompson. Psychological Studies of Human Development. 2nd ed. New York: Appleton-Century-Crofts, 1963.

Kuhlen, Raymond G., and George Greene Thompson. Psychological Studies of Human Development. 2nd ed. Appleton-Century-Crofts, 1963.