M. Yousif, Dr. Kamil. “Preliminary Assessment of Heavy Metal in Selected Sites Within Duhok City, Iraq”. American Scientific Research Journal for Engineering, Technology, and Sciences 26, no. 2 (November 13, 2016): 316–325. Accessed May 5, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2288.