Khan, S. R., M. A. Khan, R. Nawaz, and T. Karim. “Stratigraphic Control for The Age of Peshawar-Plain Magmatism, Northern Pakistan”. Journal of Himalayan Earth Sciences, vol. 23, no. 1, Nov. 1990, pp. 253-6, http://ojs.uop.edu.pk/jhes/article/view/1386.