Key points are not available for this paper at this time.
Golda S. Ginsburg, Phyllis Bronstein, Family Factors Related to Children's Intrinsic/Extrinsic Motivational Orientation and Academic Performance, Child Development, Vol. 64, No. 5 (Oct., 1993), pp. 1461-1474
Ginsburg et al. (Fri,) studied this question.