Eakachai Prapalimrungsi. 2007. Removal of humic acids from synthetic wastewater by rice husk ash and modified rice husk ash. Field of Study Environmental Science, Chulalongkorn University;
Eakachai Prapalimrungsi. (2007) Removal of humic acids from synthetic wastewater by rice husk ash and modified rice husk ash . Chulalongkorn University/Bangkok.
Eakachai Prapalimrungsi. Removal of humic acids from synthetic wastewater by rice husk ash and modified rice husk ash. . Bangkok:Chulalongkorn University, 2007.
Eakachai Prapalimrungsi. (2007) Removal of humic acids from synthetic wastewater by rice husk ash and modified rice husk ash . Chulalongkorn University/Bangkok.