M. G. Gronfula and M. Abbod, “Implementation and Development of a Global Index for Level of Service Evaluation at Airport Passenger Terminals: Hajj Terminal Saudi Arabia”, IJSBAR, vol. 21, no. 2, pp. 373–395, Apr. 2015, Accessed: Sep. 11, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/3712