Khan, M. A., and M. J. Khan. “Petrography of the Baghanwala Formation, Khewra Gorge, Khewra, Jehlum District; Punjab; Pakistan”. Journal of Himalayan Earth Sciences, vol. 12, no. 2, Aug. 1979, pp. 11-20, http://ojs.uop.edu.pk/jhes/article/view/1144.