Charoensak, P. and Sukontamarn, P. (2025) “HAPPINESS Model (9 Elements of Happiness for Older) A Model of Happiness for Thai Older Workers”, Ph.D. in Social Sciences Journal, 15(1), pp. 40–57. available at: https://so05.tci-thaijo.org/index.php/phdssj/article/view/274628 (accessed: 20 September 2026).