Upanisakorn, W., and S. Larusmee. “The Approach for Developing Community’s Morality Based Philosophy of Sufficiency”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 4, no. 1, June 2017, pp. 79-100, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/209726.