Rossely, L. A., Budiyanto, M., & Purnomo, A. R. (2023). Implementation of PBL-flipped classroom learning model to improve the learning outcomes of junior high school students in human excretion system materials. Jurnal Pijar Mipa, 18(2), 151–155. https://doi.org/10.29303/jpm.v18i2.4794