Khan, M. A., M. J. Khan, and S. A. K. Alizai. “Stratigraphy and Petrography of the Jutana Dolomite, Khewra Gorge, Khewra, Jehlum District; Punjab, Pakistan”. Journal of Himalayan Earth Sciences, vol. 9, no. 1, Mar. 1977, pp. 43-66, http://ojs.uop.edu.pk/jhes/article/view/1126.