Wongwassana, Supitchaya. “Negative Influential Factors from COVID-19 Pandemic on Passenger Service’s Happiness in Work: A Case Study of Bangkok Flight Services (BFS)”. Rajapark Journal 15, no. 39 (April 20, 2021): 15–30. Accessed May 2, 2024. https://so05.tci-thaijo.org/index.php/RJPJ/article/view/249139.