Harvareza D, Rosba E, Susanti D. Validitas E-Book Berbasis Problem Based Learning pada Materi Perubahan Lingkungan. Bioscientist j. ilm. bosbiol. [Internet]. 2023 Dec. 30 [cited 2026 Jun. 15];11(2):1084-9. Available from: https://ojspanel.undikma.ac.id/index.php/bioscientist/article/view/8835