บุญคง บ. “Happiness and Working Motivation of Workers in Suratthani Abstract Boonrirk Boonkong”. Journal of Management Sciences Suratthani Rajabhat University, vol. 3, no. 2, Dec. 2016, pp. 191-12, https://so03.tci-thaijo.org/index.php/msj/article/view/116766.