Khamkeaw, W., and R. Nopanatwongsakorn. “Needs of the Elderly in Samphanthawong District, Bangkok, for Social Welfare”. Dhammathas Academic Journal, vol. 21, no. 1, Mar. 2021, pp. 15-28, https://so06.tci-thaijo.org/index.php/dhammathas/article/view/246265.