Arikunto, Suharsimi. “PENILAIAN PRESTASI SISWA MELALUI PORTOFOLIO DALAM KURIKULUM BERBASIS KOMPETENSI”. COPE: Caraka Olah Pikir Edukatif 8, no. 01 (September 14, 2015). Accessed September 21, 2025. https://journal.uny.ac.id/index.php/cope/article/view/5433.