ประสพสุข จ., and บุญไทย อิวาย ช. “Monitoring of Pesticide Residues in Organic Waste in Amphoe Muang Khon Kaen Province”. KKU Science Journal, vol. 40, no. 3, Sept. 2012, pp. 971-80, https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/253297.