Phitthayaphinant, P., and B. Somboonsuke. “Para-Rubber Farmer’s Household Livelihoods under Para-Rubber and Rice Production System in Three Southern Border Provinces”. Journal of Humanities and Social Sciences Prince of Songkla University, vol. 17, no. 1, Sept. 2021, pp. 69-95, https://so03.tci-thaijo.org/index.php/eJHUSO/article/view/243904.