BerlyneD. E.Exploratory and epistemic behavior. In KochS. (Ed.), Psychology as a science. New York: McGraw-Hill, 1963. Vol. V. Pp. 284–364.
2.
HaanN.Proposed model of ego functioning: coping and defense mechanisms in relationship to IQ change. Psychol. Monogr., 1963, 77, No. 8 (Whole No. 571).
3.
LiebermanJ. N.The relationship between playfulness and divergent thinking: an investigation of their relationship at the kindergarten level. J. genet. Psychol., 1965, 107, 219–224.
4.
MaddiS.Exploratory behavior and variation-seeking in man. In FiskeD. W.MaddiS. (Eds.), Functions of varied experience. Homewood, Ill.: Dorsey, 1961. Pp. 253–277.
5.
MurphyL.The widening world of childhood. New York: Basic Books, 1962.
