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 A.R. Rees, Evidence of the African Origin of the oil palm, Principles. 9 (1965) 30-36.
 G.K. Helleiner, Peasant Agriculture and Economic Growth in Nigeria, Irwin Inc, 1966, p.67.
 W.L. Siew, Analysis of palm and palm kernel oils, in: Y. Bashiron, B.S. Jalani, K.W. Chan (ed. ), Advances in Oil Palm Research. Malaysian Palm Oil Board, Kuala Lumpur, Malaysia, 2000, pp.968-1035.
 H. Kifi, Studies on palm oil with special reference to interesterification, PhD Thesis, University of St. Andrews, United Kingdom, 1981, pp.6-8.
 E.A. Udensi, F.C. Iroegbu, Quality assessment of palm oil sold in major markets in Abia State, Nigeria, Agro-science. 6(2) (2007) 25-27.DOI: 10.4314/as.v6i2.1566
 N.N. Nnadozie, F.C. Osanu, T.A. Arowolo, Effect of packaging materials on stability of crude palm oil, Journal of the American Oil Chemists' Society. 67(4) (1990) 259-263.
 R. Raitio, V. Orlien, L. Skibsted, Effects of palm oil quality and packaging on the storage stability of dry vegetable bouillon paste, Journal of Food Chemistry. 132(3) (2012) 1324-1332.DOI: 10.1016/j.foodchem.2011.11.112
 P.A. Sanchez, Soil fertility and hunger in Africa, Science. 295 (2002) 2019-(2020).
 A.E. Hartemink, Soil fertility decline: definitions and assessment, Encyclopedia of Soil Science. 2 (2006) 1618-1621.
 T.R. Frederick, M.T. Louis, Soils and soil fertility, 6th ed. Ames, Iowa, Blackwell Publication, 2005, pp.123-125.
 NESREA. Federal Republic of Nigeria official Gazette, 2011, p.40.
 E.G.F. Ngando et al., Assessment of the quality of cude palm oil from smallholders in Cameroon, Journal of Stored Products and Postharvest Research. 2(3) (2011) 52-58.
 E.I. Ohimain et al., Assessment of quality of crude palm oil, produced by small holder processes in River state, Nigerian Journal of Agriculture, Food and Environment. 8(2) (2012) 20-24.
 M.U. Orji, T.I. Mbata, Effect of extraction methods on the quality and spoilage of Nigerian palm oil, African Journal of Biochemistry Research. 2(9) (2008) 192–196.
 A.W. Verla. C.O.B. Okoye, Chemistry compositions and nutritional values of two local condiments: Monodora tenuifolia and Monodora myristica seeds, Bio-Research. 4(2) (2006) 111–115.