Patana Srisuruk. (1997) Indirectness in Thai society. National Institute of Development Administration:ม.ป.ท.Patana Srisuruk. 1997. Indirectness in Thai society. ม.ป.ท.:National Institute of Development Administration;Patana Srisuruk. Indirectness in Thai society. ม.ป.ท.:National Institute of Development Administration, 1997. Print.