Phadungkit, Julairat. “Proactive Practice on Job Efficiency of Procurement Officers Mahasarakham University”. Interdisciplinary Academic and Research Journal 3, no. 6 (November 30, 2023): 669–684. accessed October 10, 2026. https://so03.tci-thaijo.org/index.php/IARJ/article/view/272032.