Eryılmaz, A., and A. Aypay. “The Relationship Between adolescents’ Motivation to Class Engagement and Their Level of Subjective Well-Being”. Journal of Human Sciences, vol. 8, no. 1, Mar. 2011, pp. 1218-33, https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/1666.