Munir, Munir, et al. “PENGARUH MODEL PROBLEM BASED LEARNING TERHADAP KETERAMPILAN PROSES SAINS PADA MATERI SISTEM PERNAPASAN DI KELAS XI SMA PGRI PRABUMULIH”. Bioilmi: Jurnal Pendidikan, vol. 3, no. 2, Dec. 2017, pp. 109-23, https://doi.org/10.19109/bioilmi.v3i2.1403.