Abid , I. A. ., I. A. Abbasi, M. A. Khan, and M. T. Shah. “Petrography and Geochemistry of the Siwalik Sandstone and Its Relationship to the Himalayan Orogeny”. Journal of Himalayan Earth Sciences, vol. 16, no. 1, Oct. 1983, pp. 65-83, http://ojs.uop.edu.pk/jhes/article/view/1212.