9Vygotsky L S. Play and Its Role in the Mental Development of the Child [J]. Voprosy Psikhologii, 1966, 12 (6): 62-76.
10Vygotsky L S. Thinking and Speech [A]. RW Rieber' A S Carton, N Minick. The Collected Works of L S Vygotsky: Vol. i. Problems of General Psychology [C]. New York: Plenum Press. 1987. 38- 285.
