Warapan Sawangnete. (1987) An experimental study of listening comprehension by using video and audio tapes in comparison with using audio tapes alone. Mahidol University,:ม.ป.ท.Warapan Sawangnete. 1987. An experimental study of listening comprehension by using video and audio tapes in comparison with using audio tapes alone. ม.ป.ท.:Mahidol University,;Warapan Sawangnete. An experimental study of listening comprehension by using video and audio tapes in comparison with using audio tapes alone. ม.ป.ท.:Mahidol University, 1987. Print.