1. American Public Health Association (APHA), American Water Works Association, Water Environmental Federation (2005) Standard Methods for Examination of Water and Wastewater, Washington, DC: United Book Press.
2. Andrade, L., Kelly, M., Hynds, P., Weatherill, J., Majury, A., & O’Dwyer, J. (2020). Groundwater resources as a global reservoir for antimicrobial-resistant bacteria. Water Research, 170, 115360. https://doi.org/10.1016/j.watres.2019.115360
3. Al-Sudani, H. I. Z. (2019). A Review on Groundwater Pollution. International Journal of Recent Engineering Science, 6(5), 14–22.
4. Azadpour-Keeley, A., Faulkner, B. R., & Chen, J.-S. (2003). Movement and Longevity of viruses in the subsurface. Environmental Protection Agency.
5. British Geological Survey, Comisión Nacional del Agua, London School of Hygiene and Tropical Medicine, & University of Birmingham. (1998). Impact of wastewater re-use on groundwater quality in the Mezquital Valley, Mexico, 1994–98 . British Geological Survey Website.