Sanprasit, Yongyut, and Thammananthika Jaengsawang. 2012. “The Influence of Job Stress and Coping Strategies on the Work Efficiency of Call Center Emplyees at Telecommunication Company”. The Journal of Behavioral Science 2 (1):11-22. https://so06.tci-thaijo.org/index.php/IJBS/article/view/2143.