Pohan, Hertika Rahayu, et al. “Efforts to Improve Student Learning Outcomes in Educational Learning Learning through the Project Based Learning Method at SMK Negeri 1 Barumun”. Indonesian Journal of Education and Social Humanities, vol. 1, no. 4, Dec. 2024, pp. 58-65, https://journal.mgedukasia.or.id/index.php/ijesh/article/view/370.