Nakwatchara, S., P. Meejaisue, and N. Chinuntdej. “The Relationship of Factors Affecting the Happy Work of Thai Pilots”. Rajapark Journal, vol. 16, no. 47, Aug. 2022, pp. 332-48, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/257002.