Olapiriyakul, S., and T. Phohom. “Simulation Modeling and Analysis of the Outpatient Clinic of the College of Medicine and Public Health, Ubon Ratchathani University”. Asia-Pacific Journal of Science and Technology, vol. 19, no. 1, Apr. 2017, pp. 82-91, https://so01.tci-thaijo.org/index.php/APST/article/view/82901.