Poondej, C., and T. Lerdpornkulrat. “Relationship Between Motivational Goal Orientations, Perceptions of General Education Classroom Learning Environment, and Deep Approaches to Learning”. Kasetsart Journal of Social Sciences, vol. 37, no. 2, June 2016, pp. 100-3, https://so04.tci-thaijo.org/index.php/kjss/article/view/242846.