Kulwarang Suwanasri. 1999. Removal efficiency of humic acid in raw water by using potassium permanganate and alum in coagulation. Faculty of Graduate Studies, Mahidol University;
Kulwarang Suwanasri. (1999) Removal efficiency of humic acid in raw water by using potassium permanganate and alum in coagulation . Mahidol University/Bangkok.
Kulwarang Suwanasri. Removal efficiency of humic acid in raw water by using potassium permanganate and alum in coagulation. . Bangkok:Mahidol University, 1999.
Kulwarang Suwanasri. (1999) Removal efficiency of humic acid in raw water by using potassium permanganate and alum in coagulation . Mahidol University/Bangkok.