Hashim, Farhad. “The Effects of Crude Oil Spill on Some Soil Properties of Different Sites in Duhok Governorate-Kurdistan Region of Iraq”. Science Journal of University of Zakho 7, no. 2 (June 30, 2019): 50-56. Accessed August 19, 2019. https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/550.