Chhiev, B., and Jongrungrot, V. “Rubber agroforestry system (RAS) practices to overcome rubber price and soil erosion in Southern Thailand”. International Journal of Agricultural Technology, vol. 17, no. 1, Jan. 2021, pp. 13-32, https://li04.tci-thaijo.org/index.php/IJAT/article/view/5897.