1. Allport, G. W. (1954).Nature of prejudice. Cambridge, MA: Addison-Wesley.
2. Bargh, J. A., & Schul, Y. (1980). On the cognitive benefits of teaching.Journal of Educational Psychology, 72, 593–604.
3. Beane, W. E., & Lemke, E. A. (1971). Group variables influencing the transfer of conceptual behavior.Journal of Educational Psychology, 62, 215–218.
4. Cohen, E. G. (1986).Designing groupwork: Strategies for the heterogeneous classroom. New York: Teachers College Press.
5. Dalton, D. W. (1990). The effects of cooperative learning strategies on achievement and attitudes during interactive video.Journal of Computer-Based Instruction, 17, 8–16.