Rungkaew Phumpho และ Singhanat Nomnian. (2015) A survey of thai business people's needs and challenges in using english for intercultural communication in asean. Mahidol University:ม.ป.ท.Rungkaew Phumpho และ Singhanat Nomnian. 2015. A survey of thai business people's needs and challenges in using english for intercultural communication in asean. ม.ป.ท.:Mahidol University;Rungkaew Phumpho และ Singhanat Nomnian. A survey of thai business people's needs and challenges in using english for intercultural communication in asean. ม.ป.ท.:Mahidol University, 2015. Print.