Abanuz, G. Y. (2011). Heavy metal contamination of surface soil around Gebze industrial area, Turkey. Micro chemical Journal, 99(1), 82-92.
 Ahmadi, B. (2012). The role of heavy metals in human health. July 20 2012. available at: Resources heavy metals.
 Alloway, B. J. (ed.). (2012). Heavy Metals in Soils: Trace Metals and Metalloids in Soils and their Bioavailability, Vol. 22. Springer Science & Business Media.
 Ashraf, M. A., Maah, M. J., and Yusoff, I. (2011). Heavy metals accumulation in plants growing in ex tin mining catchment. International Journal of Environmental Science & Technology, 8(2), 401-416.
 Bhuiyan, M. A. H., Karmaker, S. C., Bodrud-Doza, M., Rakib, M. A., and Saha, B. B. (2021). Enrichment, sources and ecological risk mapping of heavy metals in agricultural soils of dhaka district employing SOM, PMF and GIS methods. Chemosphere, 263, 128339.
 Boroujerdnia, A., Mohammadi Roozbahani, M., Nazarpour, A., Ghanavati, N., and Payandeh, K. (2020). Heavy Metal Pollution in Surface Soils of Ahvaz, Iran, Using Pollution Indicators and Health Risk Assessment. Archives of Hygiene Sciences, 9(4), 299-310.
 Chabukdhara, M., and Nema, A. K. (2012). Assessment of heavy metal contamination in Hindon River sediments: a chemometric and geochemical approach. Chemosphere, 87(8), 945-953.
 Eby, G. N. (2016). Principles of environmental geochemistry. Waveland Press.
 Farahmandkia, Z., Mehrasbi, M.R., Sekhawatju, M.S., Hasanalizadeh, A.Sh., and Ramezanzadeh, Z. (2009). Study of heavy metals in the atmospheric deposition in Zanjan, Iran. Iran. Journal of Health Environmental, 2(4), 240-249.
 Gaur, A., and Adholeya, A. (2004). Prospects of arbuscular mycorrhizal fungi in phytoremediation of heavy metal contaminated soils. Current Science, 528-534.
 Hasani Nekou, A., Karimi, A., Haghnia, G. H., and Gharaie, M. M. (2014). Effect of parent materials and pedogenic processes on distribution of Pb, Zn, Cu, and Ni in the residual soils of Binaloud zone, Western Mashhad. JWSS-Isfahan University of Technology, 18(67), 123-134. (In Persian)
 Jafari Haghighi, M. (2003). Methods of sampling and analysis of soil physical and chemical analysis with emphasis on theory and practical importance. Press Neda Zoha. 236 p.(In Persian).
 Kabata-Pendias, A., and Pendias, H. (2001). Trace elements in soils and plants, 3rd edn CRC Press. Boca Raton, FL, USA.
 Kabata‐Pendias, A., and Sadurski, W. (2004). Trace elements and compounds in soil. Elements and their compounds in the environment: Occurrence, analysis and biological relevance, 79-99.
 Kabata-Pendias, A. (2011). Trace elements in soils and plants, CRC Press is an imprint of Taylor & Francis Group, an Informa business.
 Kabata-Pendias, A., and Mukherjee, A. B. (2007). Trace elements of group 12 (Previously group IIb). Trace elements from soil to human, 283-319.
 Khan, S., Aijun, L., Zhang, S., Hu, Q., and Zhu, Y. G. (2008). Accumulation of polycyclic aromatic hydrocarbons and heavy metals in lettuce grown in the soils contaminated with long-term wastewater irrigation. Journal of hazardous materials, 152(2), 506-515.
 Khellaf, N., and Zerdaoui, M. (2010). Growth response of the duckweed Lemna gibba L. to copper and nickel phytoaccumulation. Ecotoxicology, 19(8), 1363-1368.
 Khorasanipour, M., and Aftabi, A. (2011). Environmental geochemistry of toxic heavy metals in soils around Sarcheshmeh porphyry copper mine smelter plant, Rafsanjan, Kerman, Iran. Environmental Earth Sciences, 62(3), 449-465.
 Li, X., Liu, L., Wang, Y., Luo, G., Chen, X., Yang, X., ... and He, X. (2013). Heavy metal contamination of urban soil in an old industrial city (Shenyang) in Northeast China. Geoderma, 192, 50-58.
 Madrid, L., Dı́az-Barrientos, E., & Madrid, F. (2002). Distribution of heavy metal contents of urban soils in parks of Seville. Chemosphere, 49(10), 1301-1308.
 Mai, B., Qi, S., Zeng, E.Y., Yang, Q., Zhang, G., Fu, J., Sheng, G., Peng, P. and Wang, Z. (2003). Distribution of polycyclic aromatic hydrocarbons in the coastal region off Macao, China: assessment of input sources and transport pathways using compositional analysis. Environmental Science and Technology, 37(21), 4855-4863.
 McLennan, S. M., and Taylor, S. R. (1999). Earth’s continental crust. Encyclopedia of geochemistry, 712.
 Merian, E., Anke, M., Ihnat, M., and Stoeppler, M. (2004). Elements and their compounds in the environment: occurrence, analysis and biological relevance (No. Ed. 2). Wiley-VCH Verlag GmbH & Co. KGaA.
 Muller, G. (1969). Index of geoaccumulation in sediments of the Rhine River. Geojournal, 2, 108-118.
 Nik Ravesh, M., Karimi, A., Esfandyarpur, E., and Fotovat, A. (2017). Assessment of surface soil pollution with selected heavy metals in Semnan industrial complex and surrounding areas. Journal of Natural Environment, 70(1), 211-226.
 Pournia, M., Moosavi, M. H., and Jassemi, Z. (2015). Survey of heavy metals pollution in surface soils around the industrial town of Ahvaz 2. Journal of environmental science and technology, 17(4), 23-32.
 Rostami Paydar, Gh., Rahnemarad, J. and Nazarpour, A. (2014). Assessment of heavy metal contamination in surface soils of Ahvaz Industrial Town No. 2-southwest of Iran. Geotechnical Geology, 10(1), 57-67.
 Safari, Y., Delavar, M.A., Esfandiarpour Borujeni, I., Salehi, M.H. and Owliaie, H.R. (2017). Mapping the overall soil pollution by heavy metals using limitation scores. Journal of soil management and sustainable production, 6(4), 56-70.
 Shi, G., Chen, Z., Xu, S., Zhang, J., Wang, L., Bi, C., and Teng, J. (2008). Potentially toxic metal contamination of urban soils and roadside dust in Shanghai, China. Environmental Pollution, 156(2), 251-260.
 Solgi, E., Esmaili-Sari, A. and Bakhtiari, A.R. (2013). Evaluation of mercury contamination in soils of industrial estates of Arak city. Journal of Health in the Field, 1(2).
 Suthar, S., Nema, A. K., Chabukdhara, M., and Gupta, S. K. (2009). Assessment of metals in water and sediments of Hindon River, India: impact of industrial and urban discharges. Journal of Hazardous materials, 171(1-3), 1088-1095.
 Taghipour, M., Ayoubi, S., and Khademi, H. (2011). Contribution of lithologic and anthropogenic factors to surface soil heavy metals in western Iran using multivariate geostatistical analyses. Soil and Sediment Contamination: An International Journal, 20(8), 921-937.
 Xie, S., Dearing, J. A., Boyle, J. F., Bloemendal, J., and Morse, A. P. (2001). Association between magnetic properties and element concentrations of Liverpool street dust and its implications. Journal of Applied Geophysics, 48(2), 83-92.
 Yakovlev, E. Y., Zykova, E. N., Zykov, S. B., Malkov, A. V., and Bazhenov, A. V. (2020). Heavy metals and radionuclides distribution and environmental risk assessment in soils of the Severodvinsk industrial district, NW Russia. Environmental Earth Sciences, 79, 1-16.
 Zheng, N., Liu, J., Wang, Q., and Liang, Z. (2010). Health risk assessment of heavy metal exposure to street dust in the zinc smelting district, Northeast of China. Science of the total environment, 408(4), 726-733.