AngermeierW. F.Some basic aspects of social reinforcements in albino rats. J. comp. physiol. Psychol., 1960, 53, 364–367.
2.
BinghamW. E., & GriffithsW. J.The effect of differential environments during infancy on adult behavior in the rat. J. comp. physiol. Psychol., 1952, 45, 307–312.
3.
DenenbergV. H.The effects of early experience. In HafezE. S. E. (Ed.), The behaviour of domestic animals.London: Bailliere, Tindall, & Cox, 1962. Pp. 109–138.
4.
ForgaysD. G., & ForgaysJ. W.The nature of the effects of free-environmental experience on the rat. J. comp. physiol. Psychol., 1952, 45, 322–328.
5.
HilgardE. R.Theories of learning.New York: Appleton-Century-Crofts, 1956.
6.
LindquistE. F.Design and analysis of experiments in psychology and education.Boston: Houghton Mifflin, 1953.
7.
WoodsP. J.The effects of free and restricted environmental experience on problem-solving behavior in the rat. J. comp. physiol. Psychol., 1959, 52, 399–402.
8.
ZimbardoP. G., & MontgomeryK. C.Effects of “free environment” rearing upon exploratory behavior. Psychol. Rep., 1957, 3, 589–594.
