Wittenberg, R. M. (1951). The art of group discipline: A mental hygiene approach to leadership. Association Press.
Citazione stile Chigago Style (17a edizione)Wittenberg, Rudolph M. The Art of Group Discipline: A Mental Hygiene Approach to Leadership. New York: Association Press, 1951.
Citatione MLA (8a ed.)Wittenberg, Rudolph M. The Art of Group Discipline: A Mental Hygiene Approach to Leadership. Association Press, 1951.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.