1. Abdul-Wahab, S. A., Bakheit, C. S., & Al-Alawi, S. M. (2005). Principal component and multiple regression analysis in modeling of ground-level ozone and factors Aftfecting its concentrations. Environmental Modelling & Software, 20(10), 1263–1271.
2. Achieng’, A. O., Raburu, P. O., Okinyi, L., & Wanjala, S. (2014). Use of macrophytes in the bioassessment of the health of King’wal wetland, Lake Victoria Basin, Kenya. Aquatic Ecosyste Health & Management, 17(2), 129–136.
3. Alkarkhi, A. F. M., Ahmad, A., Ismail, N., Easa, A., & Omar, K. (2008). Assessment of surface water through multivariate analysis. Journal of sustainable development, 1(3), 27–33.
4. Amadi, E. K. (2013). Nutrient loads and heavy metals assessment along Sosiani River, Kenya. Chemistry and Materials Research, 3(12), 14–20.
5. APHA. (1998). Standard methods for the examination of water and wastewater. Washington: American Public Health Association.