แซ่ลิ่ม ส. “Prevalence and Associated Factors of Depression in the Elderly in Muang district , Ranong Province”. Region 11 Medical Journal, vol. 33, no. 1, Mar. 2019, pp. 193-02, https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/191737.