Leonda, Mohamad Ardian, et al. “PENGEMBANGAN MODUL BERBASIS PROBLEM BASED LEARNING UNTUK MATERI USAHA DAN ENERGI DI SMA (SESUAI KURIKULUM 2013)”. PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL), vol. 4, Oct. 2015, pp. SNF2015-II, https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/4993.