Pangsakunyanon, Wannee, Yupaporn Yupas, and Sanya Kenaphoom. “Performance Efficiency Development of Policeman in Provincial Police Region 4”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 9, no. 3 (December 28, 2022): 573–590. Accessed May 1, 2024. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/256429.