Somboonsuke, B., and P. Phitthayaphinant. “Para-Rubber Farmer’s Household Livelihoods under Para-Rubber Monocropping Production System in Three Southern Border Provinces”. Trends of Humanities and Social Sciences Research, vol. 9, no. 2, Mar. 2021, pp. 224-4, https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/243947.