Baron, R. A. (1986). Distraction-conflict theory: Progress and problems. In L. Berkowitz (Ed.), Advances in Experimental Social Psychology (Vol. 19). Orlando, FL: Academic Press.
Triplett, N. (1898). The dynamogenic factors in pacemaking and competition. American Journal of Psychology, 9, 507-533.
Zajonc, R. B. (1965). Social facilitation. Science, 149, 269-274.