Wittenberg, R. M. (1951). The art of group discipline: A mental hygiene approach to leadership. Association Press.
Chicago-viite (17. p.)Wittenberg, Rudolph M. The Art of Group Discipline: A Mental Hygiene Approach to Leadership. New York: Association Press, 1951.
MLA-viite (8. p.)Wittenberg, Rudolph M. The Art of Group Discipline: A Mental Hygiene Approach to Leadership. Association Press, 1951.
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