Habibbulloh M. EFFECTIVENESS OF THE GUIDED DISCOVERY MODEL BASED VIRTUAL LAB PhET TOWARD MASTERY STUDENTS’ CONCEPT ON TOPIC PHOTOELECTRIC EFFECT. SEAJ [Internet]. 2019 Apr. 9 [cited 2024 Nov. 27];1(1):1-9. Available from: https://jurnalpendidikan.unisla.ac.id/index.php/SEAJ/article/view/100