@article{SaporaMitchell, author = {Sapora, A. V. and Mitchell, E. D.}, title = {Explanations of Play and Recreation}, series = {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.}, journal = {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.}, language = {en} }