Rasadakorn Yingyong และ Supong Tangkiengsirisin. (2008) Attitudes toward a conceptual model of national emergency call service :. Kasetsart University,:ม.ป.ท.Rasadakorn Yingyong และ Supong Tangkiengsirisin. 2008. Attitudes toward a conceptual model of national emergency call service :. ม.ป.ท.:Kasetsart University,;Rasadakorn Yingyong และ Supong Tangkiengsirisin. Attitudes toward a conceptual model of national emergency call service :. ม.ป.ท.:Kasetsart University, 2008. Print.