Wansangkaew, P., S. Yuphong, A. Poolkrajang, and P. Chininthorn. “The Development of Competency-based Performance Assessment Model to Develop Employees in the Security Industry”. Journal of Education Studies, Chulalongkorn University, vol. 42, Dec. 2014, pp. 18-32, https://so02.tci-thaijo.org/index.php/EDUCU/article/view/26457.