Prabowo, Agung, et al. “Material-Based Assessment of Iron and Manganese Distribution in River Water by Atomic Absorption Spectrophotometry”. Jurnal Crystal : Publikasi Penelitian Kimia Dan Terapannya, vol. 8, no. 2, Sept. 2026, pp. 445-51, doi:10.36526/jc.v8i2.9277.