TY - JOUR A1 - Sapora, A. V. A1 - Mitchell, E. D. T1 - Explanations of Play and Recreation T2 - Sapora, A. V., Mitchell, E. D. (Eds.): The Theory of Play and Recreation, 3rd edition, New York (Ronald Press) 1961, (Chapt. 4) pp. 77-111. Y1 - 1961 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/19555 N1 - Xeroxcopy ER -