HARVAREZA, Dina; ROSBA, Evrialiani; SUSANTI, Diana. Validitas E-Book Berbasis Problem Based Learning pada Materi Perubahan Lingkungan. Bioscientist : Jurnal Ilmiah Biologi, [S. l.], v. 11, n. 2, p. 1084–1089, 2023. DOI: 10.33394/bioscientist.v11i2.8835. Disponível em: https://ojspanel.undikma.ac.id/index.php/bioscientist/article/view/8835. Acesso em: 15 jun. 2026.