Key points are not available for this paper at this time.
Kenneth H. Rubin, Terrence L. Maioni, Margaret Hornung, Free Play Behaviors in Middle- and Lower-Class Preschoolers: Parten and Piaget Revisited, Child Development, Vol. 47, No. 2 (Jun., 1976), pp. 414-419
Rubin et al. (Tue,) studied this question.