Initiating Play Activity of Children: The Moderating Influence of Verbal Cues on Intrinsic Motivation

William B. Swann, Jr., Thane S. Pittman, Initiating Play Activity of Children: The Moderating Influence of Verbal Cues on Intrinsic Motivation, Child Development, Vol. 48, No. 3 (Sep., 1977), pp. 1128-1132