41.Barbara ILogoff, Cognitionasa Collaborative Progress,Handbook of Child Psychology (Fifth Edition),1998:Vol.2.Cognition, Perception, and Language: 679-698.
54.April Bay & Robert Peterson. Cooperative Games: A Way to Modify Aggressive and Cooperative Behaviorsin Young Children. Journal of Applied Behavior Analysis, 1994, Vol. 27( 3 ), 435-446.
65.Jan Jewett. Aggression and cooperation: help young children develop constru ctives trategies.Eric, 1992.