Bintarti, et al. “Development of Interactive Multimedia Based on Android Integrated Problem Based Learning (PBL) to Improve Students’s Mastery of Concepts”. Orbital: Jurnal Pendidikan Kimia, vol. 8, no. 1, June 2024, pp. 79-91, https://doi.org/10.19109/ojpk.v8i1.22057.