GUNAWAN, H. S. Improving the Learning Outcomes Bullet Repulsion Material Using Bullet Modification Media from Plastic Balls. PPSDP International Journal of Education, [S. l.], v. 3, n. 2, p. 342–359, 2024. DOI: 10.59175/pijed.v3i2.231. Disponível em: https://ejournal.ppsdp.org/pijed/article/view/231. Acesso em: 17 jun. 2026.