Rungsayatorn, S., S. Chatraphorn, and A. Hirunwong. “Life Skills Development Pattern Leading to Quality of Life of Bangkok Elderly After Retirement”. Kasetsart Journal of Social Sciences, vol. 38, no. 1, Apr. 2017, pp. 423-34, https://so04.tci-thaijo.org/index.php/kjss/article/view/242640.