@article{Piaget, author = {Piaget, Jean}, title = {Explanation of Play}, series = {Play, Dreams and Imitation in Childhood, New York (Norton \& Co) 1961, Chapt. VI, pp. 147-168.}, journal = {Play, Dreams and Imitation in Childhood, New York (Norton \& Co) 1961, Chapt. VI, pp. 147-168.}, language = {en} } @article{Piaget, author = {Piaget, Jean}, title = {Comments on Wygotsky's Critical Remarks Concerning >The Language and Thought of the Child< and >Judgement and Reasoning in the Child<. The M. I. T. Press, Massachusetts Institute of Technology, 1962, pp. 1-14.}, language = {en} }