Khamsombat, K., Songsanit, S. and Simmatun, P. (2019) “Self-Efficacy Encouragement by Learning Activities”, KKU Research Journal (Graduate Studies) Humanities and Social Sciences, 7(3), pp. 69-78. Available at: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/226954 (Accessed: 18February2020).