ทองมาก กันยารัตน์. “A Study of Motivation for Morale Al Work : A Case Study of Department of Airports, Ministry of Transport”. Integrated Social Science Journal, Mahidol University 6, no. 2 (December 12, 2019): 290–327. Accessed May 3, 2024. https://so02.tci-thaijo.org/index.php/isshmu/article/view/228902.