Hasanah, Tri Anita Nur, Choirul Huda, and Maris Kurniawati. “Pengembangan Modul Pembelajaran Fisika Berbasis Problem Based Learning (PBL) Pada Materi Gelombang Bunyi Untuk Siswa SMA Kelas XII”. Momentum: Physics Education Journal 1, no. 1 (March 31, 2017): 56-65. Accessed January 18, 2022. https://ejournal.unikama.ac.id/index.php/momentum/article/view/1631.