Sungsri, S., Aimsamang, C. ., Nilabutra, S. ., Sungsri, P. ., & Bunparit, N. . (2021). Development of Learning Promotion Strategy and System for Working Age Population in the 21st Century. Journal of Humanities and Social Sciences Thonburi University, 15(3), 62–73. Retrieved from https://so03.tci-thaijo.org/index.php/trujournal/article/view/250906