Soulivanh voravong และ Kasem Chunkao. (2014) Watershed management for controlling water quality of Phetchaburi river,Phetchaburi province,Thailand. kasetsart University:ม.ป.ท.Soulivanh voravong และ Kasem Chunkao. 2014. Watershed management for controlling water quality of Phetchaburi river,Phetchaburi province,Thailand. ม.ป.ท.:kasetsart University;Soulivanh voravong และ Kasem Chunkao. Watershed management for controlling water quality of Phetchaburi river,Phetchaburi province,Thailand. ม.ป.ท.:kasetsart University, 2014. Print.