Nutjira Busadee และ Bhinyo Panijpan. (2010) Enhancing highschool students' achievement in permutations and combinations through nontraditional word problems,sport problems,and probabilistic games. Mahidol University:ม.ป.ท.Nutjira Busadee และ Bhinyo Panijpan. 2010. Enhancing highschool students' achievement in permutations and combinations through nontraditional word problems,sport problems,and probabilistic games. ม.ป.ท.:Mahidol University;Nutjira Busadee และ Bhinyo Panijpan. Enhancing highschool students' achievement in permutations and combinations through nontraditional word problems,sport problems,and probabilistic games. ม.ป.ท.:Mahidol University, 2010. Print.