Sutrio, Sutrio, dkk. “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 (JPFT), vol. 9, no. 2, Desember 2023, hlm. 274-83, doi:10.29303/jpft.v9i2.5826.