Naidu, R., Sumner, M. E. and Harter, R. D. (1998). Sorption of heavy metal in strongly weather soils. An overview. J. Environ. Geochem. Health, 20, 5 – 9.
Okoronkwo, N.E., Odemelam, S.A. and Ano, O.A. (2006). Level of toxic elements in soils of abandoned waste dumpsites. Afr, J. Biotechnol., 5 (13), 1241-1244
Olajire, A.A, Ayodele, E.T. Oyediran, G.O. and Oluyemi, E.O. (2003). Levels and speciation of heavy metals in soils of industrial southern Nigeria. Environ. Monit. Assess. 85, 135-155
Olajire, A.A, Ayodele, E.T. Oyediran, G.O. and Oluyemi, E.O. (2002). Levels and speciation of heavy metals in soils of industrial southern Nigeria. Environ. Monit. Assess. 85, 135-155
Olajire, A.A. and Ayodele, E.T. (1998). Heavy metals analysis of solid municipal waste in the western part of Nigeria. Water, Air and Soil Pollut., 103, 219-228
Olurunfemi, J.F. and Odita, C.O. (1998): “Landuse and Solid Waste Generation in Olorin, Kwara State, Nigeriaâ€. The Environmentalist, Vol.18, No. 2 Pg 67 –75.
Ouatmane A,. Provenzano M.R,. Hafidi M and. Senesi N, (2000). Compost maturity assessment using calorimetry, spectroscopy and chemical analysis, Comp. Sci. Util. 8(2), pp. 135–146.
Park S, Choi KS, Joe KS, Kim WH, Kim HS (2001) Variations of landfill leachate''s properties in conjunction with the treatment process. Environ. Technol.22(6): 639–645. publications/reinhart_00-13.PDF (28/2/2008, 1:11pm).
Rautenbach, R., and Mellis, R., (1994). Waste water treatment by a combination of bioreactor and Nano filtration. Desalination95(2):171–188
Renoua, S., Givaudan, J., GPoulain , S. , Dirassouyan, F., Moulin P., (2008), Landfill leachate treatment: Review and opportunity, J. of Hazardous Materials 150(3) 468–493
Smith, C.J., Hopmans, P. and Cook, F.J. (1996). Accumulation of Cr, Pb, Cu, Ni, Zn and Cd in soil following irrigation with untreated effluents in Australia. Environ. Pollut. 94, 317-323
Steensen M. (1997). Chemical oxidation for the treatment of leachate-process comparison and results from full-scale plants. Water Science and Technology 35(4): 249-256.
Tessier, A., Campbell, P. G. C. and Bisson, M. (1979). Sequential extraction procedure for the speciation of particulate trace metals. Anal. Chem., 51 (7), 844 - 851
Tonni A.K., Lo W.Y., Chan G.Y., (2005), Physico-chemical treatments for removal of recalcitrant contaminants from landfill leachate, J. of Hazardous materials, 129 (1-3): 80-100.
Trebouet, D., Schlumpf, J.P, Jaouen, P., and, Quemeneur, F. 2001. Satbilized landfill leachate treatment by combined physicochemical-nanofiltration processes. Water Research. 35(12) :2935-2942.