Syed Sahil, S. A., and R. Awang Hashim. “The Roles of Social Support in Promoting Adolescents’ Classroom Cognitive Engagement Through Academic Self-Efficacy”. Malaysian Journal of Learning and Instruction, vol. 8, Jan. 2011, pp. 49-69, https://e-journal.uum.edu.my/index.php/mjli/article/view/7626.