Purwati Kuswarini, Aji Riyanto, & Egi. (2020). Wimba learning strategy with PjBL model: How the effect student in excretory system concept?. Biosfer: Jurnal Pendidikan Biologi, 13(2), 292–306. https://doi.org/10.21009/biosferjpb.v13n2.292-306