Warasak Phuangcharoen. (1993) Speech perception ability of the persons who loss the high frequency. Mahidol University,:ม.ป.ท.Warasak Phuangcharoen. 1993. Speech perception ability of the persons who loss the high frequency. ม.ป.ท.:Mahidol University,;Warasak Phuangcharoen. Speech perception ability of the persons who loss the high frequency. ม.ป.ท.:Mahidol University, 1993. Print.