Rusdiana Putri KD, Muhlis M, Ramdani A. The Validity of Android-Based Biology Teaching Materials to Improve Students’ Concept Mastery. J. Prisma. Sains [Internet]. 2021 Dec. 30 [cited 2025 Aug. 16];9(2):199-203. Available from: https://e-journal3.undikma.ac.id/index.php/prismasains/article/view/4202