4Leslie A M. Pretense and representation: the origins of 'theory of mind' Psychological Review, 1987, 94: 412 - 426.
5Piaget J. Play, dreams, and imitation in childhood. New York: Norton, 1962. 120-142.
6Vygotsky L S. Play and its role in the mental develop- ment of the child. The Psychology E - book Collection, 1966. 13 - 19.
7Erikson E. Sex differences in play configurations of pre- adolescents. American Journal of Ortho Psychiatry, 1951, (21): 667 -692.
8Kanner L. Follow- up study of eleven autistic children originally reported in 1943. Focus on Autistic Behavior, 1992, (7): 1-11.
9Kanner L. Affective disturbances of affective contact. Nervous Child, 1943, (2) :217 - 250.
10Ricks D M, Wing L. language, communication, and the use of symbols in normal and autistic children. Jour- nal of Autism and Childhood Schizophrenia, 1975, (5) : 191 - 221.
