Ali Brohi, Manzoor, and Aftab A. Shaikh. “Assessment of Perceived Service Quality Using Servqual Mod-El: A Case Study of Pakistan International Airline (PIA) in-Flight Hospitality”. International Journal of Basic and Applied Sciences 8, no. 2 (October 19, 2019): 11–19. Accessed May 5, 2024. https://www.sciencepubco.com/index.php/ijbas/article/view/29714.