Muhammad Gunawan, and Rahmad Hidayat , trans. 2021. “Determination of Zinc Level of Catfish (Clarias Batrachus) From Sei Sikambing Market by Visible Light Spectrophotometry”. Jurnal Indah Sains Dan Klinis 2 (2): 22-28. https://doi.org/10.52622/jisk.v2i2.22.