Phurapatkiattikul, Y., and T. Snongtaweeporn. “People Saving Status for Pre-Aging Readiness”. RMUTP Research Journal Humanities and Social Sciences, vol. 4, no. 2, July 2020, pp. 1-14, https://so05.tci-thaijo.org/index.php/rmutphuso/article/view/179591.