Phoglad, S., A. Kwanyou, and S. Chardchawarn. “Assessing the Effectiveness of Social Security Old Age Benefits”. Journal of Multidisciplinary Academic Research and Development (JMARD), vol. 4, no. 3, Sept. 2022, pp. 36-71, https://he02.tci-thaijo.org/index.php/JMARD/article/view/258323.