Woodworth, R. S., & Marquis, D. G. (1949). Psychology (20. ed.). Methuen.

Woodworth, Robert S., and Donals G. Marquis. Psychology. 20. ed. London: Methuen, 1949.

Woodworth, Robert S., and Donals G. Marquis. Psychology. 20. ed. Methuen, 1949.