Wichitsathain, B., and N. Chuersuwan. “Piggery Wastewater Pretreatment by Physico-chemical Techniques”. Suranaree Journal of Science and Technology, vol. 13, no. 1, Aug. 2026, pp. 29-37, https://ph04.tci-thaijo.org/index.php/SUJST/article/view/15948.