Parameth Lordasa และ Chanika Gampper. (2007) A survey study of the role of attitudes and motivation in learning English. Thammasat University,:ม.ป.ท.Parameth Lordasa และ Chanika Gampper. 2007. A survey study of the role of attitudes and motivation in learning English. ม.ป.ท.:Thammasat University,;Parameth Lordasa และ Chanika Gampper. A survey study of the role of attitudes and motivation in learning English. ม.ป.ท.:Thammasat University, 2007. Print.