Kanchak, Angsuma, Somsanguan Passago, Pornpimol Ponkham, and Somsuk Trisupakitti. 2026. “Heavy Metal Contamination in Soil at Waste Disposal Site and Surrounding Paddy Field Area in Khok Sa-At Subdistrict Administrative Organization, Khong Chai District, Kalasin Province”. Burapha Science Journal 26 (1 January-April). Chonburi, Thailand:610-27. https://li05.tci-thaijo.org/index.php/buuscij/article/view/1456.