Martin, Dliya Syahirah Eka, Rahmi Susanti, Elvira Destiansari, and Kodri Madang. 2025. “The Effect of Problem Based Learning Model in Science Process Skills on Respiratory System Materials”. Biosfer: Jurnal Pendidikan Biologi 18 (2):122-30. https://doi.org/10.21009/biosferjpb.54257.