Panggabean DD, Sembiring SS. PEMBUATAN E-MODUL FISIKA BERBASIS PROBLEM BASED LEARNING MATERI USAHA DAN ENERGI. JPF Unimed [Internet]. 2022 Dec. 28 [cited 2025 Dec. 21];11(2):116-21. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpf/article/view/38467