Puddin, Azli, et al. “Discovering Competency’s Elements in the Affective Domain of a Sustainable Co-Curricular Syllabus”. International Journal of Sustainable Construction Engineering and Technology, vol. 14, no. 2, May 2023, pp. 223-31, https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/13891.