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, vol. 9, no. 4, Desember 2021, doi:10.24114/jpp.v9i4.18439.