Ritkaew, S., S. . Aujirapongpan, U. Pattanapradit, and J. Jutidharabongse. “The Relationship Between Happiness and Work Performance of Production Operators of Suretex Company Limited”. Journal of Management Sciences Suratthani Rajabhat University, vol. 7, no. 1, June 2020, pp. 97-117, https://so03.tci-thaijo.org/index.php/msj/article/view/243745.