8Johnson,D,Johnson,R and Holubec,E and Roy,P Circles of Learning: Cooperation in the Classroom [M]. Alexandria,VA: Association for Supervision and Curdculum Development,1984/1990. 89-125.
9Lewis,R and Doorlag,D. Teaching Special Students in the mainsteam [M]. New York: Merrill/Macmillan, 1991. 45-56.
10Kagan,S. Cooperative Learning[M]. San Juan Capistrano,CA: Resources for Teachers, 1992. 34-78.