Boyong, F. “Cooperative Learning Methods for Improving Achievement in the Subject of Electrical Engineering and Energy Conversion in Class X Students of Mechanical Engineering at SMK Negeri 2 Samarinda”. Educationist: Journal of Educational and Cultural Studies, vol. 1, no. 1, Oct. 2022, pp. 287-93, https://jurnal.litnuspublisher.com/index.php/jecs/article/view/154.