Viengnakhone Vongxay และ Wattasit Siriwong. (2011) Household air pollution, respiratory symptoms, rural, urban, Vientiane Capital, Lao PDR. Chulalongkorn University:ม.ป.ท.Viengnakhone Vongxay และ Wattasit Siriwong. 2011. Household air pollution, respiratory symptoms, rural, urban, Vientiane Capital, Lao PDR. ม.ป.ท.:Chulalongkorn University;Viengnakhone Vongxay และ Wattasit Siriwong. Household air pollution, respiratory symptoms, rural, urban, Vientiane Capital, Lao PDR. ม.ป.ท.:Chulalongkorn University, 2011. Print.