Z. . Salah Hussein, “Simulation Model Of Hotels By Using Discrete Event System”, J. eng. sustain. dev., vol. 18, no. 1, pp. 144–151, Jan. 2014, Accessed: May 11, 2025. [Online]. Available: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/856