Ullah, K., M. Arif, M. T. Shah, and I. A. Abbasi. “The Lower and Middle Siwaliks Fluvial Depositional System of the Western Himalayan Foreland Basin, Kohat, Pakistan ”. Journal of Himalayan Earth Sciences, vol. 42, no. 1, Nov. 2009, pp. 61-85, http://ojs.uop.edu.pk/jhes/article/view/1631.