Sofiyah, Siti. “Application Of Problem Based Learning Models To Improve Biologi Learning Outcomes Of VIII Class MTs Negeri 1 Tuban”. Inovasi: Jurnal Diklat Keagamaan, vol. 14, no. 2, Oct. 2020, pp. 156-68, doi:10.52048/inovasi.v14i2.162.