Butt, K.A., and Zahir Shah. “Discovery of Blue Beryl from Ilum Granite and Its Implications on the Genesis of Emerald Mineralization in Swat District”. Journal of Himalayan Earth Sciences 18, no. 1 (March 30, 1985): 75-81. Accessed November 29, 2024. http://ojs.uop.edu.pk/jhes/article/view/1285.