Pongchitsiri S. “Prevalence and Predicting Factors of Depression among Elderly in Primary Care Unit, Chachoengsao Province”. Journal of The Department of Medical Services 43, no. 5 (October 1, 2018): 81–86. accessed September 25, 2026. https://he02.tci-thaijo.org/index.php/JDMS/article/view/247780.