JohnsonD. W., & JohnsonR. T. (1987). Learning together and alone: Cooperative, competitive, and individualistic learning. Englewood Cliffs, NJ: Prentice Hall.
2.
SlavinR. E.SharanS.KaganS.Hertz-LazarowitzR.WebbC., & SchmuckR. (Eds). (1985). Learning to cooperate, cooperating to learn. New York: Plenum.
3.
VockellE. L., & SchwartzE. (1992). The computer in the classroom (2nd ed.). Santa Cruz, CA: McGraw Hill.