Bayley, N.Manual for the Bayley Scales of Infant Development. New York: Psychological Corporation, 1969.
3.
Beizer, L., Hrneir, E., Naifeh, M., Most, R., & Belsky, J. From exploration to play in infancy. Paper presented at the meeting of the Society for Research in Child Development, Boston, April 1981.
4.
Belsky, J., & Most, R.K.From exploration to play: A cross-sectional study of infant free play behavior. Developmental Psychology, 1981, 17, 630–639.
5.
Bruner, J.S., Jolly, A., & Sylva, K. (Eds.). Play: Its role in development and evolution. New York: Basic Books, 1976.
6.
Case, R.A developmentally based theory and technology of instruction. Review of Educational Research, 1978, 48, 439–463.
Elder, J.L., & Pederson, D.R.Preschool children's use of objects in symbolic play. Child Development, 1978, 49, 500–504.
9.
Enslein, J.P., & Fein, G.G.Temporal and cross-situational stability of children's social and play behavior. Developmental Psychology, 1981, 17, 760–761.
10.
Fein, G.G.Pretend play in childhood: An integrative review. Child Development, 1981, 52, 1095–1118.
11.
Garvey, C.Play. Cambridge, Mass.: Harvard University Press, 1977.
12.
Ghiaci, G., & Richardson, J.T.The effects of dramatic play upon cognitive development and structure. Journal of Genetic Psychology, 1980, 136, 77–83.
13.
Guralnick, M.J.The social behavior of preschool children at different developmental levels: Effects of group composition. Journal of Experimental Child Psychology, 1981, 31, 115–130.
14.
Hill, P.M., & McCune-Nicolich, L.M.Pretend play and patterns of cognition in Down's syndrome children. Child Development, 1981, 52, 611–617.
15.
Hughes, M.Sequential analysis of exploration and play. International Journal of Behavioral Development, 1978, 1, 83–97.
16.
Hughes, M.Exploration and play revisited: A hierarchical analysis. International Journal of Behavioral Development, 1979, 2, 215–224.
17.
Lowe, M.Trends in the development of representational play in infants from one to three years: An observational study. Journal of Child Psychology and Psychiatry, 1975, 16, 33–47.
18.
McCune-Nicolich, L.M.Toward symbolic functioning: Structure of early pretend games and potential parallels with language. Child Development, 1981, 52, 785–797.
Nicolich, L.M.Beyond sensorimotor intelligence: Assessment of symbolic maturity through analysis of pretend play. Merrill-Palmer Quarterly, 1977, 23(2), 8999.
21.
Parten, M.B.Social participation among preschool children. Journal of Abnormal and Social Psychology, 1932, 27, 243–269.
22.
Pelligrini, A.D.The relationship between kindergartners' play and achievement in prereading, language, and writing. Psychology in the Schools, 1980, 17, 530–535.
23.
Piaget, J.Play, dreams and imitation in childhood. New York: Norton, 1962.
24.
Piaget, J.Piaget's theory. In P. Neubauer (Ed.), The process of child development. New York: New American Library, 1976.
25.
Rubin, K.H., & Maioni, T.L.Play preference and its relationships to egocentrism, popularity and classification skills in preschoolers. Merrill-Palmer Quarterly, 1975, 21, 171–179.
26.
Rubin, K.H., Maioni, T.L., & Hornung, M.Free play behaviors in middle- and lower-class preschoolers: Parten and Piaget revisited. Child Development, 1976, 47, 414–419.
27.
Sigel, I.E., & Cooking, R.R.Cognitive development from childhood to adolescence. New York: Holt, Rinehart & Winston, 1977.
28.
Smilansky, S.The effects of sociodramatic play on disadvantaged preschool children. New York: Wiley, 1968.
29.
Smith, P.K.A longitudinal study of social participation in preschool children: Solitary and parallel play reexamined. Developmental Psychology, 1978, 14, 517–523.
30.
Ungerer, J.A., & Sigman, M.Symbolic play and language comprehension in autistic children. Journal of Child Psychiatry, 1981, 20, 318–337.
31.
Ungerer, J.A., Zelazo, P.R., Kearsley, R.B., & O'Leary, K.Developmental changes in the representation of objects in symbolic play from 18 to 34 months of age. Child Development, 1981, 52, 186–195.
32.
Vandenberg, B.Play and development from an ethological perspective. American Psychologist, 1978, 33, 724–738.
33.
Vandenberg, B.Environmental and cognitive factors in social play. Journal of Experimental Child Psychology, 1981, 31, 169–175.
34.
Whittaker, C.A.A note on developmental trends in the symbolic play of hospitalized profoundly retarded children. Journal of Child Psychology and Psychiatry, 1980, 21, 253–261.
35.
Wing, L., Gould, J., Yeates, S.R., & Brierly, L.M.Symbolic play in severely mentally retarded and autistic children. Journal of Child Psychology and Psychiatry, 1977, 18, 167–178.