Naratip rusme และ Nawarat siritararatn. (2557) The influence of motivation on learning performance: a study of kasetsart university students in the course 'english through song'. Kasetsart university:ม.ป.ท.Naratip rusme และ Nawarat siritararatn. 2557. The influence of motivation on learning performance: a study of kasetsart university students in the course 'english through song'. ม.ป.ท.:Kasetsart university;Naratip rusme และ Nawarat siritararatn. The influence of motivation on learning performance: a study of kasetsart university students in the course 'english through song'. ม.ป.ท.:Kasetsart university, 2557. Print.