Purwoto AD, Suharno S, Sukarmin S. 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. jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2022 Apr. 30 [cited 2024 Nov. 22];8(2):911-7. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/1198