Chairungruang, Duangrit Benjathikul. “Achievement in Police Drug Prevention and Suppression duties of Metropolitan Police Divison 9”. Journal of the Association of Researchers 25, no. 3 (December 22, 2020): 465–476. accessed October 7, 2026. https://so04.tci-thaijo.org/index.php/jar/article/view/247924.