Wanlapa Chitchiaranai และ Apisit Songsasen. (2011) Preparation, characterization and photocatalytic application of nitrogen and sulfur co-doped TiO2 photocatalyst /Wanlapa Chitchiaranai. Kasetsart University:ม.ป.ท.Wanlapa Chitchiaranai และ Apisit Songsasen. 2011. Preparation, characterization and photocatalytic application of nitrogen and sulfur co-doped TiO2 photocatalyst /Wanlapa Chitchiaranai. ม.ป.ท.:Kasetsart University;Wanlapa Chitchiaranai และ Apisit Songsasen. Preparation, characterization and photocatalytic application of nitrogen and sulfur co-doped TiO2 photocatalyst /Wanlapa Chitchiaranai. ม.ป.ท.:Kasetsart University, 2011. Print.