1. Abbas, F. M. A., Anees, A., Norli, I., Azhar, M. E., & Khalid, O. (2008). Assessment of surface water through multivariate analysis. Journal of Sustainable Development, 1, 27–33.
2. Alberto, W. D., Del Pilar, D. M., Valeria, A. M., Fabiana, P. S., Cecilia, H. A., & Ngeles, B. M. (2001). Pattern recognition techniques for the evaluation of spatial and temporal variations in water quality. A case study: Suqui A River Basin (Cordoba—Argentina). Water Research, 35, 2881–2894.
3. Ameel, J. J., Axler, R. P., & Owen, C. J. (1993). Persulfate digestion for determination of total nitrogen and phosphorus in low-nutrient waters. American Environmental Laboratory, 10(93), 1–11.
4. APHA (American Public Health Association). (1998). Standard methods for examination of water and waste water (20th ed.). New York: American Public Health Association.
5. Bilotta, G. S., Brazier, R. E., & Haygarth, P. M. (2007). The impacts of grazing animals on the quality of soils, vegetation, and surface waters in intensively managed grasslands. Advances in Agronomy, 94, 237–280.