Limeviriyakul, P. A., and P. Ratchatapibhunphob. “Pressure in Performing Duties of the Subordinates of Non-Commissioned Police Officers, Metropolitan Police Division 6”. Journal of Humanities and Social Sciences, Rajapruk University, vol. 6, no. 1, Apr. 2020, pp. 135-48, https://so03.tci-thaijo.org/index.php/rpu/article/view/242233.