Samakkee Boonyawat, and Kanchana Kurdmemoon. “The study on Water Quality from Paddy Field practicing : Case Study of Suphanburi Province”. Agriculture and Natural Resources, vol. 30, no. 4, Dec. 1996, pp. 475-84, https://li01.tci-thaijo.org/index.php/anres/article/view/241199.