(Wanichat), P. T. D., Wongpornpawan, C., Rajpariyativimol, P., Kaewketpong, P. and Subharamedhi, P. S. (2019) “The Ethics: The Gratefulness for a Previous Benefactor”, Dhammathas Academic Journal, 19(4), pp. 245–254. available at: https://so06.tci-thaijo.org/index.php/dhammathas/article/view/147515 (accessed: 7 December 2025).