Akdemir, E., & Arstan, A. (2012). From past to present: Trend analysis of cooperative learning studies. 2012 International Conference on New Horizons in Education INTE, Sakarya University, Turkey.
Artut, P. D. (2010). Experimental evaluation of the effectives of cooperative learning on kindergarten children's mathematics ability. International Journal of Educational Research, 48, 370-380. doi: 10.1016/j.ijer.2010.04.001