Hamid, M. Syamil Bin Shahul, Glenn Baxter, and Graham Wild. “Passenger Perceptions towards Service Quality of Airlines Based in Singapore”. International Review of Management and Marketing 11, no. 1 (February 22, 2021): 78–91. Accessed May 2, 2024. https://econjournals.com/index.php/irmm/article/view/9096.