1. Adelekan, B. A., & Abegunde, K. D. (2011). Heavy metal contamination of soil and groundwater at automobile mechanic villages in Ibadan, Nigeria. International Journal of Physical Sciences, 6(5), 1045–1058.
2. Ağca, N., Yalçın, M., Ödemis, B. (2006) Quality determination of some water sources in the Amik Plain (Hatay/Turkey). The Proceedings of the 18th International Soil Meeting (ISM) on Soil Sustaining Life on Earth, Managing, Soil and Technology, Sanlıurfa, Turkey, (1), 320-326.
3. Alabdula’aly, A. I., Al Zarah, A. I., & Khan, M. A. (2011). Assessment of trace metals in groundwater sources used for drinking purposes in Riyadh Region. International Journal of Water Resources and Arid Environments, 1(1), 05–09.
4. Alam, M., Rais, S., & Aslam, M. (2012). Hydrochemical investigation and quality assessment of groundwater in rural areas of Delhi, India. Environmental Earth Science, 66, 97–110.
5. Anonymous (1999). Phosphorus in Minnesota’s groundwater. Minnesota pollution control agency. Groundwater monitoring and assessment program.