Yoelao, Dusadee, Piyarat Thammapitak, and Ujsara Prasertsin. 2016. “Causes and Effects of Depression and Anxiety Disorders Among the Elderly in Thailand”. The Journal of Behavioral Science 11 (2), 51-62. https://so06.tci-thaijo.org/index.php/IJBS/article/view/63279.