Rossely, Lyta Adela, et al. “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, vol. 18, no. 2, Mar. 2023, pp. 151-5, doi:10.29303/jpm.v18i2.4794.