Ullah, K., M. Arif, and M. T. Shah. “Petrography of Sandstones from the Kamlial and Chinji Formations, Southwestern Kohat Plateau, NW Pakistan: Implications for Source Lithology and Paleoclimate ”. Journal of Himalayan Earth Sciences, vol. 39, no. 1, Nov. 2006, pp. 1-13, http://ojs.uop.edu.pk/jhes/article/view/1604.