Munira Ibrahim, Ireen, Choong-Yeun Liong, Sakhinah Abu Bakar, and Ahmad Farid Najmudd. 2018. “Performance Improvement of the Yellow Zone in Emergency Department Using Discrete Event Simulation Approach”. International Journal of Engineering & Technology 7 (4.33): 102-5. https://doi.org/10.14419/ijet.v7i4.33.23509.