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 C. O. Princewill and N. N. Adanma, “Metal Concentration in Soil and Plants in Abandoned Cement Factory,” International Conference on Biotechnology and Environment Management IPCBEE, Singapore, 2011, Vol. 18, pp. 146-150.
 E. G. Ameh, M. S. Kolawole and E. G. Imeokparia, “Using Factor-Cluster Analysis and Enrichment Methods to Evaluate Impact of Cement Production on Stream Sediments around Obajana Cement Factory in Kogi State, North Central Nigeria,” Advances in Applied Science Research, Vol. 2, No. 1, 2011, pp. 76-89.
 S. S. Al-Oud, M. E. A. Nadeem, B. H. Al-Shbel, “Distribution of Heavy Metals in Soils and Plants around a Cement Factory in Riyadh City, Central Of Saudi Arabia,” American-Eurasian Journal of Agriculture and Environmental Science, Vol. 11, No. 2, 2011, pp. 183-191.
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 S. Estifanos and A. Degefa, “Assessing the Effect of Cement Dust Emission on the Physicochemical Nature of Soil around Messebo Area, Tigray, North Ethiopia,” International Journal of Economic and Environmental Geology, Vol. 3, No. 2, 2012, pp. 12-20.
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 J. Hlavay, T. Prohaska, M. Weisz, W. W. Wenzel and G. J. Stingeder, “Determination of Trace Elements Bound to Soils and Sediment Fractions,” IUPAC Technical Report, International Union of Pure and Applied Chemistry, Vol. 76, No. 2, 2004, pp. 415-442.
 S. de Villiers, C. Thiart and N. C. Basson, “Identification of Sources of Environmental Lead in South Africa from Surface Soil Geochemical Maps,” Environmental Geochemistry and Health, Vol. 32, 2010, pp. 451-459.
 A. Probst, L. Hernandez and J. L. Probst, “Heavy Metals Partioning in Three French Forest Soils by Sequential Extraction Procedure,” Journal De Physique IV, France, Vol. 107, 2003, pp. 1103-1106.
 O. A. Al-Khashman and R. A. Shawabkeh, “Metals Distribution in Soils around the Cement Factory in Southern Jordan,” Environmental Pollution, Vol. 140, No. 3, 2006, pp. 387-394.
 G. M. A. Bermudez, M. Moreno, R. Invernizzi, R. Pla and L. M. Pignata, “Evaluating Top Soil Trace Element Pollution in the Vicinity of a Cement Plant and a Former Open-Cast Uranium Mine in Central Argentina,” Journal of Soils and Sediments, Vol. 10, No. 7, 2010, pp. 1308-1323. http://dx.doi.org/10.1007/s11368-010-0243-1
 G. H. Guo, F. C. Wu, F. Z. Xie and R. Q. Zhang, “Spatial Distribution and Pollution Assessment of Heavy Metals in Urban Soils from Southwest China,” Journal of Environmental Sciences, Vol. 24, No. 3, 2012, pp. 410-418.
 K. B. Mmolawa, A. S. Likuku and G. K. Gaboutloeloe, “A Preliminary Study Of Heavy Metal Contamination Along Major Roads In Botswana,” International Journal of Environmental Science, Management and Engineering Research, Vol. 1, No. 1, 2012, pp. 10-19.
 J. O. Olowoyo, E. van Heerden and J. Fischer, “Trace Metals Concentrations in Soil From Different Sites in Pretoria, South Africa,” Sustainable Environmental Research, Vol. 23, No. 2, 2013, pp. 93-99.
 A. M. Abdel-Rahman and M. M. Ibrahim, “Effect of Cement Dust Deposition on Physiological Behaviors of Some Halophytes in the Salt Marshes of Red Sea,” Egyptian Academic Journal of biological Sciences, Vol. 3, No. 1, 2012, pp. 1-11.