Sasiwimol Wannalai และ Wattasit Siriwong. (2016) Assessment of knowledge and perception of adverse health effects associated with self prevention from air pollution in Traffic Policemen Bangkok Thailand. Chulalongkorn University:ม.ป.ท.Sasiwimol Wannalai และ Wattasit Siriwong. 2016. Assessment of knowledge and perception of adverse health effects associated with self prevention from air pollution in Traffic Policemen Bangkok Thailand. ม.ป.ท.:Chulalongkorn University;Sasiwimol Wannalai และ Wattasit Siriwong. Assessment of knowledge and perception of adverse health effects associated with self prevention from air pollution in Traffic Policemen Bangkok Thailand. ม.ป.ท.:Chulalongkorn University, 2016. Print.