Charoensak, Piyawat, and Pataporn Sukontamarn. 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):40-57. https://so05.tci-thaijo.org/index.php/phdssj/article/view/274628.