Porntep Kongkapetchawan. 1996. Emulsion liquid membrane separation of copper from aqueous solution. Bangkok:Chulalongkorn University;
Porntep Kongkapetchawan. (1996) Emulsion liquid membrane separation of copper from aqueous solution (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Porntep Kongkapetchawan. Emulsion liquid membrane separation of copper from aqueous solution. Bangkok:Chulalongkorn University, 1996.
Porntep Kongkapetchawan. (1996) Emulsion liquid membrane separation of copper from aqueous solution (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.