Thammachai, Kunyapornwun. “The Causal Model of Training Effectiveness of Traffic Operation Officers in the State Railway of Thailand”. WMS Journal of Management 7, no. 1 (January 30, 2018): 39–54. Accessed March 29, 2024. https://so06.tci-thaijo.org/index.php/wms/article/view/110645.