Purwoto, A. D. ., Suharno, S., & Sukarmin, S. (2022). Development of A Problem-Based Physics E-Module with A Flipped Classroom Approach Using Sigil Software as An Alternative Learning Media During the COVID-19 Pandemic. Jurnal Penelitian Pendidikan IPA, 8(2), 911–917. https://doi.org/10.29303/jppipa.v8i2.1198