@book{33090,
	author = {Festinger, Leon, and Schacher, Stanley. [joint au.]},
	title = {Social pressures in informal groups :},
	publisher = {Tavistock,},
	year = {c1950 [Reissued 1963].},
	address = {London :},
	note = {"A publication of the Research Center for Group Dynamics, University of Michigan."}
}