Plengrudsamee, Narimol. “Depression and psychosocial factors related to depression in the elderly in Thungyang subdistrict, Laplae district, Uttaradit province”. Phetchabun Medical Journal 3, no. 3 (December 25, 2023): 271–86. accessed September 23, 2026. https://he03.tci-thaijo.org/index.php/PMJ/article/view/2919.