Nasri, M., et al. “Pengembangan Bahan Ajar Ilmu Pengetahuan Alam (IPA) Berbasis Problem Based Learning (PBL)”. Bioscientist : Jurnal Ilmiah Biologi, vol. 9, no. 2, Dec. 2021, pp. 297-1, doi:10.33394/bioscientist.v9i2.4010.