Sami Kamel, R., K. Rashid Mauff, and A. Abbas Hassan. “Assessment of Some Groundwater Wells in the West of Al Najaf City for by Water Quality Index (WQI)”. Al-Qadisiyah Journal of Pure Science, Vol. 23, no. 2, May 2018, pp. 177 -89, doi:10.29350/jops.2018.23.2.751.