ยกอิ่นจ., and นิลวรางกูรเ. “QUALITY OF LIFE OF RUBBER FARMERSIN NAKHON SI THAMMARAT PROVINCE”. Journal of Boromarajonani College of Nursing, Bangkok, Vol. 34, no. 1, Jan. 2018, pp. 130-4, https://www.tci-thaijo.org/index.php/bcnbangkok/article/view/136939.