Ritonga, Pangoloan Soleman. “KAJIAN SPEKTRA IR DAN AAS LEMPUNG TERPILAR–Fe”. Photon: Jurnal Sain dan Kesehatan 3, no. 1 (October 30, 2012): 37–44. Accessed January 18, 2026. https://ejurnal.umri.ac.id/index.php/photon/article/view/147.