Sutrio, S. et al. 2023. The Effectiveness of the Problem Based Flipped Classroom Model with E-Modules in Improving Critical Thinking Skills of Pre-Service Physics Teachers . Jurnal Pendidikan Fisika dan Teknologi. 9, 2 (Dec. 2023), 274–283. DOI:https://doi.org/10.29303/jpft.v9i2.5826.