Piyawat Saipan และ Suthep Ruangwises. (2008) Health risk assessment for people in Ronphibun district, Nakhon Si Thammarat province from exposure to arsenic. Chulalongkorn University:ม.ป.ท.Piyawat Saipan และ Suthep Ruangwises. 2008. Health risk assessment for people in Ronphibun district, Nakhon Si Thammarat province from exposure to arsenic. ม.ป.ท.:Chulalongkorn University;Piyawat Saipan และ Suthep Ruangwises. Health risk assessment for people in Ronphibun district, Nakhon Si Thammarat province from exposure to arsenic. ม.ป.ท.:Chulalongkorn University, 2008. Print.