Harvareza, D., Rosba, E. and Susanti, D. (2023) “Validitas E-Book Berbasis Problem Based Learning pada Materi Perubahan Lingkungan”, Bioscientist : Jurnal Ilmiah Biologi, 11(2), pp. 1084–1089. doi: 10.33394/bioscientist.v11i2.8835.