WRENN, C. GILBERT. “Foreword.” Group Treatment in Psychotherapy: A Report of Experience, by ROBERT G. HINCKLEY and LYDIA HERMANN, NED - New edition ed., University of Minnesota Press, MINNEAPOLIS, 1951, pp. v-viii, www.jstor.org/stable/10.5749/j.cttts6vm.2. Accessed 31 May 2020.
WRENN, C. (1951). Foreword. In HINCKLEY R. & HERMANN L. (Authors), Group Treatment in Psychotherapy: A Report of Experience (pp. V-Viii). MINNEAPOLIS: University of Minnesota Press. Retrieved May 31, 2020, from www.jstor.org/stable/10.5749/j.cttts6vm.2
WRENN, C. GILBERT. "Foreword." In Group Treatment in Psychotherapy: A Report of Experience, by HINCKLEY ROBERT G. and HERMANN LYDIA, V-Viii. MINNEAPOLIS: University of Minnesota Press, 1951. Accessed May 31, 2020. www.jstor.org/stable/10.5749/j.cttts6vm.2.
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