Diedrich, R. C. (1972). Group procedures: purposes, processes, and outcomes: Selected readings for the counselor. Houghton Mifflin Company.
Chicago-Zitierstil (17. Ausg.)Diedrich, Richard C. Group Procedures: Purposes, Processes, and Outcomes: Selected Readings for the Counselor. Boston: Houghton Mifflin Company, 1972.
MLA-Zitierstil (9. Ausg.)Diedrich, Richard C. Group Procedures: Purposes, Processes, and Outcomes: Selected Readings for the Counselor. Houghton Mifflin Company, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.