Chaiwuttisak, P., W. Yangwai, W. Meesat, and S. Somkeartvera. “Simulation of a Queuing System to Increase the Service Efficiency of Outpatient Department: A Case Study of Mueangpan Hospital, Lampang Province”. Journal of Science Ladkrabang, vol. 29, no. 1, June 2020, pp. 10-22, https://li01.tci-thaijo.org/index.php/science_kmitl/article/view/235740.