Abdjul, Tirtawaty, and Nova Ntobuo. “Developing Device of Learning Based on Virtual Laboratory through Phet Simulation for Physics Lesson With Sound Material”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 39, no. 2 (June 28, 2018): 105–115. Accessed April 28, 2024. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9002.