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2. ?Proceedings of the First National Conference of Water Pollution and Pesticide Residues in Food?, University of Ibadan, Nigeria, p.?206-207;
3. ?Introduction to Soil Microbiology?, John Wiley & Sons Inc. New York and London, 1961, p.?402-421.
4. ?Petroleum Geochemistry and Geology?, W.?H. Freeman and Company San Francisco, 1996, p.?231-238.
5. C.?M. Onojake, M.Sc. Thesis, University of Port Harcourt, Nigeria.