Intraskul, Suthee, Buncha Somboonsuke, Narisa Thongtrai, and Purawich Phitthayaphinant. “Cost of Para-Rubber Production and Selling Problems of Para-Rubber Farmers in Thailand”. Kasetsart Journal of Social Sciences 39, no. 3 (December 1, 2018): 817–828. Accessed May 7, 2024. https://so04.tci-thaijo.org/index.php/kjss/article/view/242608.