1. Aronson, E. (1978).The jigsaw classroom. Beverly Hills, CA: Sage.
2. Bereiter, C. (1994). Constructivism, socioculturalism, and Popper's wold 3.Educational Researcher, 23(7), 21–23.
3. Briggs, J., Nichol, J., Brough, D., & Watson, L. (1991).PEG tools in the classroom. Exeter: University of Exeter.
4. Brown, A., Ash, D., Nakagawa, K., Gordon, A., & Campione, J. (1993). Distributed expertise in the classroom. In G. Salomon (Ed.),Distributed cognitions: Psychological and educational considerations (pp. 188–228). Cambridge: Cambridge University Press.
5. [ERIC Document Reproduction Service;A. L. Brown,1993