Osuocha, K., E. Akubugwo, G. Chinyere, and A. Ugbogu. “Seasonal Impact on Phyto-Accumulation Potentials of Selected Edible Vegetables Grown in Ishiagu Quarry Mining Effluent Discharge Soils”. African Journal of Environmental Science and Technology, vol. 10, no. 1, Jan. 2016, pp. 34-43, doi:10.5897/ajest2015.2002.