Nattee Kaewraya และ Pornsiri Muangsamai. (2010) An investigation of needs and opinions about English language learning of air technical students at the Air Technical Training School, Directorate of Education and Training, the Royal Thai Air Force. Kasetsart University,:ม.ป.ท.Nattee Kaewraya และ Pornsiri Muangsamai. 2010. An investigation of needs and opinions about English language learning of air technical students at the Air Technical Training School, Directorate of Education and Training, the Royal Thai Air Force. ม.ป.ท.:Kasetsart University,;Nattee Kaewraya และ Pornsiri Muangsamai. An investigation of needs and opinions about English language learning of air technical students at the Air Technical Training School, Directorate of Education and Training, the Royal Thai Air Force. ม.ป.ท.:Kasetsart University, 2010. Print.