Apisara Sritulanon และผู้แต่งคนอื่นๆ. (2007) An analysis of Thai English teachers' self-perception of pronunciation difficulties in English. Language Institute, Thammasat University,:ม.ป.ท.Apisara Sritulanon และผู้แต่งคนอื่นๆ. 2007. An analysis of Thai English teachers' self-perception of pronunciation difficulties in English. ม.ป.ท.:Language Institute, Thammasat University,;Apisara Sritulanon และผู้แต่งคนอื่นๆ. An analysis of Thai English teachers' self-perception of pronunciation difficulties in English. ม.ป.ท.:Language Institute, Thammasat University, 2007. Print.