Chen-Wuing, L., Kao-Hung, L. and Yi-Ming., B. (2003). Application of factor analysis in the assessment of groundwater quality in a Blackfoot disease area in Taiwan. Journal of the Science of the Total Environment, 313, 77-89.
 Faryadi, S., Shahedi, K. and Nabatpoor, M. (2011). Investigation of Water Quality Parameters in Tadjan River using Multivariate Statistical Techniques. WatershedManagement Journal, 3(6), 75-92.
 Frid Gigloo, B., Najafinejad, A. and Moghani Bilehsavar, V. (2013). Evaluation of water quality variation of Zarringol river, Golestan province. Journal of Water and Soil Conservation, 20, 78-96.
 Gorji Anari, M. and Rafahi, H. GH. (1995). Study of saline surface water of Ajichai watershed and effect of erosion on its quantity. Iranian Journal of Agriculture Science, 26(4), 43-59.
 Karami, F. and Bayatieh Khatibi, M. (2011). Spatial monitoring of the groundwater quality in different geological formations (Case study: upstream of Aghi-Chi watershed). Journal of Geography and Regional Development, 17, 27-47.
 Mirzai, M., Riahi-Bakhtiar, A., Salman-Mahini, A. and Gholamalifard, M. (2013). Analysis of the physical and chemical quality of Mazandaran province (Iran) rivers using multivariate statistical methods. Mazandaran University of Medical Sciences, 23(108), 41-52.
 Murdoch, P. S., Baron, J. S. and Miller, T.L. (2000). Potential effects of climate change on surface water quality in North America. Journal of the American Water Resources Association, 36, 347-366.
 Noori, R., Khakpour, A., Omidvar, B. and Farokhnia A. (2010). Comparison of ANN and principal component analysis-multivariate linear regression models for predicting the river flow based on developed discrepancy ratio statistic. Expert Systems withApplications, 37(8), 5856-5862.
 Nosrati, K., Derafshi, Kh., Ghrachahi, S. and Rahimi, Kh. (2011). Assessment of Surface Water Quality in Haraz-Ghara Soo Watershed using Multivariate Statistical Techniques. Research Earth Science Journal, 5, 41-55.
 Ouyang, Y. (2005). Evaluation of river water quality monitoring stations by principal component analysis. Water Research, 39(12), 2621-35.
 Papatheodorou, G., Demopouloua, G. and Lambrakis, N. (2006). A long-term study of temporal hydro chemical data in a shallow lake using multivariate statistical techniques. Journal of Ecological Modeling, 193, 759-776.
 Rabia Koklu, R., Sengorur, B. and Topal, B. (2010). Water Quality Assessment Using Multivariate Statistical Methods—A Case Study: Melen River System (Turkey). Water Resources Management, 24, 959–978.
 Rasi Nezami, S., Nazariha, M., Baghvand, A. and Moridi, A. (2012). Karkheh River Water Quality Using Multivariate Statistical Analysis and Qualitative Data Variations. Journal of Health System Research, 8(7), 1280-92.
 Razmkhah, H., Abrishamchi, A. and Torkian, A. (2010). Evaluation of spatial and temporal variation in water quality by pattern recognition techniques: A case study on Jajrood River (Tehran, Iran). Journal of Environmental Management, 91, 852-860.
 Salajeghe, A., Razavi Zadeh, S., Khorasani, N., Hamidfar, M. and Salajeghe, S. (2010). Land use changes and their impact on the river water quality (Case study: Karkheh watershed). Journal of Environmental Studies, 58, 81-86.
, K., Malik, A., Mohan, D. and Sinha., S. (2004). Multivariate statistical techniques for the evaluation of spatial and temporal variations in water quality of Gomti River (India)—a case study. Water Research
, 38, 3980–3992.
 Zare Chahoky, M. (2009). Data analysis in natural resources research using SPSS software. University of Tehran press.