Bertcher, H. J. (1979). Group participation techniques for leaders and members. Published in cooperation with the Continuing Education Program in the Human Services of the University of Michigan School of Social Work [by] Sage Publications.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bertcher, Harvey J. Group Participation Techniques for Leaders and Members. Beverly Hills, Calif.: Published in cooperation with the Continuing Education Program in the Human Services of the University of Michigan School of Social Work [by] Sage Publications, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bertcher, Harvey J. Group Participation Techniques for Leaders and Members. Published in cooperation with the Continuing Education Program in the Human Services of the University of Michigan School of Social Work [by] Sage Publications, 1979.