Theerawongnukul, H., Ratana-Ubol, A., & Keeratiburana, Y. (2014). The Development of A Program to Enhance Self-Esteem and Social Skills of Non-Formal Education Students. Journal of Education Studies, Chulalongkorn University, 42, 92–109. retrieved from https://so02.tci-thaijo.org/index.php/EDUCU/article/view/26462