สุขดี จ. and ช้างขวัญยืน ป. (2020) “The Concept of Sufficiency in Sufficiency Economy”, Journal of the Association of Researchers, 21(1), pp. 61–73. available at: https://so04.tci-thaijo.org/index.php/jar/article/view/243078 (accessed: 22 September 2026).