REFERENCE
1. Books
Prescott, L. M., Harley, J. P., & Klein, D. A. (2008). Microbiology (7th ed.). McGraw Hill.
Madigan, M. T., Martinko, J. M., & Parker, J. (2015). Brock Biology of Microorganisms (14th ed.). Pearson.
2. Research Papers / Articles
Smith, J. & Brown, P. (2012). "Diversity of Microorganisms in Freshwater Ecosystems." Journal of Environmental Biology, 33(2), 215-220.
Kumar, S., & Gupta, R. (2018). "Microbial Population and Their Role in Aquatic Ecosystems." International Journal of Microbial Studies, 45(3), 150-167.
3. Websites / Online Databases
National Center for Biotechnology Information (NCBI): www.ncbi.nlm.nih.gov
World Health Organization (WHO) Water Quality Reports: www.who.int
Environmental Protection Agency (EPA):
4. Local Government