Khattak, M., I. Ahmed, M. Parvez, J. Ahmad, and A. Ahmad. “Carbonatite Body Near Khungai, Rustam Area, District Mardan, North Pakistan”. Journal of Himalayan Earth Sciences, vol. 17, no. 1, Mar. 1984, pp. 175-6, http://ojs.uop.edu.pk/jhes/article/view/1278.