Sakchai Pattra. 2002. Pathogenic microorganisms disinfection in sludge after wastewater treatment from hospital. Field of Study Environmental Science, Naresuan University;
Sakchai Pattra. (2002) Pathogenic microorganisms disinfection in sludge after wastewater treatment from hospital . Naresuan University/Phitsanulok.
Sakchai Pattra. Pathogenic microorganisms disinfection in sludge after wastewater treatment from hospital. . Phitsanulok:Naresuan University, 2002.
Sakchai Pattra. (2002) Pathogenic microorganisms disinfection in sludge after wastewater treatment from hospital . Naresuan University/Phitsanulok.