Plengrudsamee, N. . “Depression and psychosocial factors related to depression in the elderly in Thungyang subdistrict, Laplae district, Uttaradit province”. Phetchabun Medical Journal, vol. 3, no. 3, Dec. 2023, pp. 271-86, https://he03.tci-thaijo.org/index.php/PMJ/article/view/2919.