Jantra, N., and T. Salawongluk. “Factors Related to Quality of Life of Elderly in Khok- Kruat Sub-District, Mueang Nakhon Ratchasima District, Nakhon Ratchasima Province Administration Organization”. Journal of Vongchavalitkul University, vol. 36, no. 1, June 2023, pp. 50-66, https://ph01.tci-thaijo.org/index.php/vujournal/article/view/253094.