Rossely LA, Budiyanto M, Purnomo AR. Implementation of PBL-flipped classroom learning model to improve the learning outcomes of junior high school students in human excretion system materials. J. Pijar.MIPA [Internet]. 2023 Mar. 30 [cited 2024 May 20];18(2):151-5. Available from: https://jurnalfkip.unram.ac.id/index.php/JPM/article/view/4794