Prompen Wattanbud และ Supong Tungkientsirisil. (2008) Attitudes towards the use of English of customer relations officers at the British Council (Thailand). Language Institute, Thammasat University,:ม.ป.ท.Prompen Wattanbud และ Supong Tungkientsirisil. 2008. Attitudes towards the use of English of customer relations officers at the British Council (Thailand). ม.ป.ท.:Language Institute, Thammasat University,;Prompen Wattanbud และ Supong Tungkientsirisil. Attitudes towards the use of English of customer relations officers at the British Council (Thailand). ม.ป.ท.:Language Institute, Thammasat University, 2008. Print.