1. Columbia Water Centre (CWC), (2009). “Learn More: Ground Water”. Retrieved 2009-09-15.
2. Girja Shankar, Tailor and C.P. Singh Chandel, (2010).‘To Assess the Quality of Ground Water in Malpur Tehsil (Tonk, Rajisthan, India) with Emphasis to Fluoride Concentration”, Journal, Nature and Science; 8(11).
3. Llamas.M. and Martínez-Cortina,L. (2009). “Specific aspects of groundwater use in water ethics”. M.Llamas, L.Martínez-Cortina and A.Mukherji (eds), Water Ethics. Leiden, the Netherlands, CRC Press/Balkema, pp.187–204.
4. Water Level Changing’s in the High Plains Aquifers;Marget,2008
5. “Microbial and Physicochemicl Assessment of the Quality of Domestic Water Sources in Selected Rural Communities of the Eastern Cape Province”, South Africa;Zamxaka;Water SA,2004