1. Abdullah, E. J. (2013). Quality assessment for Shatt Al-Arab River using heavy metal pollution index and metal index. Journal of Environment and Earth Science, 3(5), 114–120.
2. Alavi, M., Hajian, J., Amidi, M., & Bolourchi, H. (1982). Geology of Takab–Shahin–Dez Quadrangle, Geological Survey of Iran, Ministry of Mines and Metals of Iran, 100pp.
3. Alberto, W. D., Del Pilar, D. M., Valeria, A. M., Fabiana, P. S., Cecilia, H. A., & de Los Angeles, B. M. (2001). Pattern recognition techniques for the evaluation of spatial and temporal variations in water quality. A case study: Suquı́a River Basin (Cَrdoba–Argentina). Water Research, 35(12), 2881–2894.
4. Andrejiová, M., Kimáková, Z., & Knežo, D. (2011). Analysis of water pollution indicators with the use of selected statistical methods. Acta Mechanica Slovaca, 15(3), 52–61.
5. ANZECC and ARMCANZ. (2000). Australian and New Zealand guidelines for fresh and marine water quality. National water quality management strategy paper no. 4, Australian and New Zealand Environment and Conservation Council (ANZECC) and Agriculture and Resource Management Council of Australia and New Zealand (ARMCANZ), Canberra. 314.