Gronfula, M. G., & Abbod, M. (2015). Implementation and Development of a Global Index for Level of Service Evaluation at Airport Passenger Terminals: Hajj Terminal Saudi Arabia. International Journal of Sciences: Basic and Applied Research (IJSBAR), 21(2), 373–395. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3712