Peer Interaction in Same- and Mixed-Age Triads in Relation to Chronological Age and Incentive Condition.Published in:Child Development, 1976, v. 47, n. 3, p. 707, doi. 10.2307/1128185By:Graziano, William;French, Doran;Brownell, Celia A.;Hartup, Willard W.Publication type:Article