RITONGA, P. S. KAJIAN SPEKTRA IR DAN AAS LEMPUNG TERPILAR–Fe. Photon: Jurnal Sain dan Kesehatan, [S. l.], v. 3, n. 1, p. 37–44, 2012. DOI: 10.37859/jp.v3i1.147. Disponível em: https://ejurnal.umri.ac.id/index.php/photon/article/view/147. Acesso em: 9 mar. 2026.