Somboonsuke, Buncha, Purawich Phitthayaphinant, and Vichot Jongrungrot. 2017. “Simulation modeling of para-rubber and oil palm farming system in Khlongthom district, Krabi province”. Kasetsart Journal of Social Sciences 38 (3):728-41. https://so04.tci-thaijo.org/index.php/kjss/article/view/242787.