Ullah, S., M. W. Javed, M. Shafique, and S. F. Khan. “An Integrated Approach for Quality Assessment of Drinking Water Using GIS: A Case Study of Lower Dir”. Journal of Himalayan Earth Sciences, vol. 47, no. 2, Nov. 2014, pp. 163-74, http://ojs.uop.edu.pk/jhes/article/view/1698.