Subsing, B. ., P. . Tanpichai, and R. . Chudasring. “Causal Model for Quality of Life of the Elderly in Bangkok Slums”. Kasetsart Journal of Social Sciences, vol. 42, no. 2, Apr. 2021, pp. 345-50, https://so04.tci-thaijo.org/index.php/kjss/article/view/251215.