Bertcher, H. J. (1994). Group participation: Techniques for leaders and members (2nd ed.). Published in cooperation with the University of Michigan School of Social Work [by] Sage.

Bertcher, Harvey J. Group Participation: Techniques for Leaders and Members. 2nd ed. Thousand Oaks, Calif: Published in cooperation with the University of Michigan School of Social Work [by] Sage, 1994.

Bertcher, Harvey J. Group Participation: Techniques for Leaders and Members. 2nd ed. Published in cooperation with the University of Michigan School of Social Work [by] Sage, 1994.