Kanha But และ Ranjna Jindal. (2016) Investigations of effluent quality of Cha-Am municipality wastewater treatment ponds system. Mahidol University:ม.ป.ท.Kanha But และ Ranjna Jindal. 2016. Investigations of effluent quality of Cha-Am municipality wastewater treatment ponds system. ม.ป.ท.:Mahidol University;Kanha But และ Ranjna Jindal. Investigations of effluent quality of Cha-Am municipality wastewater treatment ponds system. ม.ป.ท.:Mahidol University, 2016. Print.