This work is licensed under a
Creative Commons Attribution 4.0 International License
 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: https://doi.org/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: https://doi.org/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.
 E. Ebere, V. Wirnkor, E. Chinedu, V. Ngozi, "A Review on the Quality of Palm Oil (Elaeis guineensis) Produced Locally in Imo State, Nigeria", Sustainable Food Production, Vol. 4, p. 40, 2018DOI: https://doi.org/10.18052/www.scipress.com/SFP.4.40
 E. Verla, A. Verla, A. Osisi, P. Okeke, C. Enyoh, "Finding a relationship between mobility factors of selected heavy metals and soil particle size in soils from children’s playgrounds", Environmental Monitoring and Assessment, Vol. 191, 2019DOI: https://doi.org/10.1007/s10661-019-7937-7
 E. Verla, A. Verla, C. Enyoh, "Finding a relationship between physicochemical characteristics and ionic composition of River Nworie, Imo State, Nigeria", PeerJ Analytical Chemistry, Vol. 2, p. e5, 2020DOI: https://doi.org/10.7717/peerj-achem.5
 C. Enyoh, B. Isiuku, "Characterisation of some soils from flood basin in Amakohia, Owerri, Nigeria", International Journal of Environmental Analytical Chemistry, p. 1, 2020DOI: https://doi.org/10.1080/03067319.2020.1773455
 B. Isiuku, C. Enyoh, "Monitoring and modeling of heavy metal contents in vegetables collected from markets in Imo State, Nigeria", Environmental Analysis Health and Toxicology, Vol. 35, p. e2020003, 2020DOI: https://doi.org/10.5620/eaht.e2020003
 F. Ohiagu, K. Lele, P. Chikezie, A. Verla, C. Enyoh, "Bioaccumulation and health risk assessment of heavy metals in Musa paradisiaca, Zea mays, Cucumeropsis manii and Manihot esculenta cultivated in Onne, Rivers State, Nigeria", Environmental Analysis Health and Toxicology, Vol. 35, p. e2020011, 2020DOI: https://doi.org/10.5620/eaht.e2020011
 C. Enyoh, B. Isiuku, "Determination and Human Health Risk Assessment of Heavy Metals in Floodbasin Soils in Owerri, Southeastern Nigeria", Chemistry Africa, 2020DOI: https://doi.org/10.1007/s42250-020-00171-2
 C. Enyoh, F. Ohiagu, A. Verla, E. Verla, "A chemometric review of heavy metals (Zn, Cd, Pb, Fe, Cu, Ni and Mn) in top soils of Imo state, Southeastern Nigeria", International Journal of Environmental Analytical Chemistry, p. 1, 2020DOI: https://doi.org/10.1080/03067319.2020.1807535
 C. Enyoh, A. Verla, E. Verla, E. Enyoh, "Effect of Macro- and Micro-Plastics in Soil on Quantitative Phytochemicals in Different Part of Juvenile Lime Tree (Citrus aurantium)", International Journal of Environmental Research, 2020DOI: https://doi.org/10.1007/s41742-020-00292-z
 V. Eze, C. Enyoh, C. Ndife, "Soil Cationic Relationships, Structural and Fertility Assessment Within Selected Active Dumpsites in Nigeria", Chemistry Africa, 2020DOI: https://doi.org/10.1007/s42250-020-00194-9