PRATOMO AL., Hern. PENEMPATAN La (dan Ac) SERTA Lu (dan Lr) DALAM SISITEM PERIODIK UNSUR. Jurnal Cakrawala Pendidikan, [S. l.], v. 2, n. 2, 2016. DOI: 10.21831/cp.v2i2.9186. Disponível em: https://journal.uny.ac.id/index.php/cp/article/view/9186. Acesso em: 20 may. 2025.