Sutthirak Sapsirin และผู้แต่งคนอื่นๆ. (2006) A study of trait factors of oral language ability in a computer-based speaking test for Thai university students. Chulalongkorn University:ม.ป.ท.Sutthirak Sapsirin และผู้แต่งคนอื่นๆ. 2006. A study of trait factors of oral language ability in a computer-based speaking test for Thai university students. ม.ป.ท.:Chulalongkorn University;Sutthirak Sapsirin และผู้แต่งคนอื่นๆ. A study of trait factors of oral language ability in a computer-based speaking test for Thai university students. ม.ป.ท.:Chulalongkorn University, 2006. Print.