Banthao, J., R. Kaewhlang, and R. Klaenkratoke. “An Analysis of Queuing System With Simulation Model at a Drug Dispensing: A Case Study of Chok Chai Hospital”. Thai Industrial Engineering Network Journal, vol. 4, no. 1, June 2018, pp. 17-23, https://ph02.tci-thaijo.org/index.php/ienj/article/view/180483.