Adawiah, Radiatul. “Efektivitas Pembelajaran Berbasis Portofolio Pada Mata Kuliah Trigonometri”. CENDEKIA: JURNAL ILMIAH PENDIDIKAN 7, no. 1 (March 29, 2019): 89-97. Accessed June 27, 2026. https://ejurnal.stkip-pb.ac.id/index.php/jurnal/article/view/123.