Tulashi Devi Pradhan และ Amonrat Wattanatorn. (2014) Effects of cooperative learning on mathemtics achievement and social skills of the sixth grade students of mendrelgang primary school in bhutan. Naresuan University:ม.ป.ท.Tulashi Devi Pradhan และ Amonrat Wattanatorn. 2014. Effects of cooperative learning on mathemtics achievement and social skills of the sixth grade students of mendrelgang primary school in bhutan. ม.ป.ท.:Naresuan University;Tulashi Devi Pradhan และ Amonrat Wattanatorn. Effects of cooperative learning on mathemtics achievement and social skills of the sixth grade students of mendrelgang primary school in bhutan. ม.ป.ท.:Naresuan University, 2014. Print.