1. Alemayehu, T. (2001). The impact of uncontrolled waste disposal on surface water quality in Addis Ababa, Ethiopia. SINET: Ethiopian Journal of Science, 24(1), 93–104.
2. Amare, T. A., Yimer, G. T., & Workagegn, K. B. (2014). Assessment of metals concentration in water, sediment and macrophyte plant collected from Lake Hawassa, Ethiopia. Journal of Environmental & Analytical Toxicology, 4(247), 2161–2525.
3. Antweiler, R. C., & Taylor, H. E. (2008). Evaluation of statistical treatments of left-censored environmental data using coincident uncensored data sets: I. Summary Statistics. Environmental Science & Technology, 42(10), 3732–3738.
4. Ataro, A., Wondimu, T., & Chandravanshi, B. S. (2003). Trace metals in selected fish species from lakes Awassa and Ziway, Ethiopia. SINET: Ethiopian Journal of Science, 26(2), 103–114.
5. Avila-Pérez, P., Balcázar, M., Zarazúa-Ortega, G., Barceló-Quintal, I., & Dıaz-Delgado, C. (1999). Heavy metal concentrations in water and bottom sediments of a Mexican reservoir. Science of the Total Environment, 234(1–3), 185–196.