Khattak , M. U. K., and D. S. Stakes. “New Data on the Metamorphism of the Nanga Parbat-Haramosh Massif, and the Adjoining Ladakh Island Arc Terrain, Northern Pakistan”. Journal of Himalayan Earth Sciences, vol. 26, no. 1, Nov. 1993, pp. 1-16, http://ojs.uop.edu.pk/jhes/article/view/1440.