Shah, M. T., and A. Gohar. “Geotechnical and Geochemical Studies of Eocene Limestone of Kohat Formation for Its Use As Concrete Aggregates”. Journal of Himalayan Earth Sciences, vol. 36, no. 1, Nov. 2003, pp. 11-22, http://ojs.uop.edu.pk/jhes/article/view/1562.