Mashiatullah, A., R. M. Qureshi, N. Ahmad, T. Javed, and Z. Shah. “Distribution of Trace Metals in Inter-Tidal Sediment Along Karachi Coast, Pakistan”. Journal of Himalayan Earth Sciences, vol. 37, no. 1, Nov. 2004, pp. 215-23, http://ojs.uop.edu.pk/jhes/article/view/1587.