Nuanjun Pasda และ Supamard Panichsakpatana. (2008) Biological assessment on suitability of composts derived from Bankok city sewage sludge for agricultural production. Kasetsart University,:ม.ป.ท.Nuanjun Pasda และ Supamard Panichsakpatana. 2008. Biological assessment on suitability of composts derived from Bankok city sewage sludge for agricultural production. ม.ป.ท.:Kasetsart University,;Nuanjun Pasda และ Supamard Panichsakpatana. Biological assessment on suitability of composts derived from Bankok city sewage sludge for agricultural production. ม.ป.ท.:Kasetsart University, 2008. Print.