Siregar, Najihah Fakhirah, dan Ely Djulia. “THE EFFECT OF PROBLEM BASED LEARNING MODEL ON STUDENTS’ SELF-CONCEPT AND METACOGNITIVE ABILITY ON EXCRETION SYSTEM”. Jurnal Pelita Pendidikan 9, no. 4 (Desember 31, 2021). Diakses Juli 3, 2025. https://jurnal.unimed.ac.id/2012/index.php/pelita/article/view/18439.