Noerdin, Isjrin. “Evaluation of the Spectrophotometric Determination of Zinc With Methylene Blue and Thiocyanate”. Journal of Mathematical and Fundamental Sciences 3, no. 4 (February 6, 2019): 187-203. Accessed May 1, 2026. https://journals.itb.ac.id/index.php/jmfs/article/view/9772.