Chonlisa Chariyalertsak. (1990) The willingness to buy voluntary health insurance in Chiangmai Municipality. Mahidol University,:ม.ป.ท.Chonlisa Chariyalertsak. 1990. The willingness to buy voluntary health insurance in Chiangmai Municipality. ม.ป.ท.:Mahidol University,;Chonlisa Chariyalertsak. The willingness to buy voluntary health insurance in Chiangmai Municipality. ม.ป.ท.:Mahidol University, 1990. Print.