Muhammad Naveed Anjum, Nowrad Ali, Zaif Ur Rehman, Muhammad Ghayas, and Waqas Ahmad. “Rock Aggregate Potential of Limestone Units in the Khyber Formation, Pakistan”. International Journal of Economic and Environmental Geology 9, no. 4 (November 20, 2018): 26–33. Accessed December 17, 2025. http://www.econ-environ-geol.org/index.php/ojs/article/view/665.