Oktaviantina, Ria. “Efforts to Improve Student Learning Outcomes Using the Problem Based Learning Model in High School Students”. KOGNITIF: Jurnal Ilmiah Pendidikan Dan Keguruan, vol. 1, no. 2, Dec. 2024, pp. 26-33, https://journal.mgedukasia.or.id/index.php/kognitif/article/view/226.