หวังเบ็ญหมัด ชุติมา. “Delivering Happiness”. Journal of Management Sciences Suratthani Rajabhat University 3, no. 2 (March 26, 2018): 213–224. Accessed May 3, 2024. https://so03.tci-thaijo.org/index.php/msj/article/view/116769.