Yaiying, W. ., T. . Suppadit, and K. . Kunta. “Human Resource Development for Environmental Based on the Philosophy of the Sufficiency Economy”. Business Review Journal, vol. 12, no. 2, Dec. 2020, pp. 221-35, https://so01.tci-thaijo.org/index.php/bahcuojs/article/view/240659.