JPPPF, Editor. “Front Matter JPPPF Volume 5 Issue 2, December 2019 ”. Jurnal Penelitian & Pengembangan Pendidikan Fisika 5, no. 2 (December 31, 2019). Accessed April 21, 2025. http://103.8.12.212:33180/unj/index.php/jpppf/article/view/13547.