Yaiying, Wullop, Tawadchai Suppadit, and Karika Kunta. “Human Resource Development for Environmental Based on the Philosophy of the Sufficiency Economy”. Business Review Journal 12, no. 2 (December 25, 2020): 221-235. Accessed May 15, 2021. https://so01.tci-thaijo.org/index.php/bahcuojs/article/view/240659.