Mohammad Jamil Ali Al-Talabani. “Stratigraphic Study of Qalqula Formation, Sulaymaniyah Governorate - NE Iraq”. Tikrit Journal of Pure Science 23, no. 10 (January 20, 2019): 60–65. Accessed June 17, 2025. https://tjpsj.org/index.php/tjps/article/view/564.