Intraskul, S., Somboonsuke, B., Thongtrai, N., & Phitthayaphinant, P. (2018). Cost of para-rubber production and selling problems of para-rubber farmers in Thailand. Kasetsart Journal of Social Sciences, 39(3), 817–828. Retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/242608