Theerapong Palakaprasith และ Kamolrat Jarusratsamee. (2009) Factors influencing working people's decisions to take English courses at language institutions. Language Institute, Thammasat University,:ม.ป.ท.Theerapong Palakaprasith และ Kamolrat Jarusratsamee. 2009. Factors influencing working people's decisions to take English courses at language institutions. ม.ป.ท.:Language Institute, Thammasat University,;Theerapong Palakaprasith และ Kamolrat Jarusratsamee. Factors influencing working people's decisions to take English courses at language institutions. ม.ป.ท.:Language Institute, Thammasat University, 2009. Print.