Ayokhai FEF (2008). 'Indigenous Science and Technology in Edo Society: Agricultural Produce Processing among the Uzairhue of Benin Province, 1900–1960', (unpublished M.A. Dissertation, Nasarawa State University, Keffi, Oct.).

Ayokhai FEF (2015). 'A History of the Oil Palm Industry in Nigeria: A Study of Benin Province, 1914 – 1965', (Unpublished Ph.D Thesis, Nasarawa State University, Keffi).

Bradbury RE, Lloyd PC (1957). The Benin Kingdom and the Edo-Speaking Peoples of South-Western Nigeria, (London: International African Institute).

Hugh C (1920). National Council, Address by the Governor, 20th December.

Igbafe PA (1980). "The Pre-Colonial Economic Foundations of the Benin Kingdom" In: I.A. Akinjogbin and S.O. Osoba (Eds.), Topics on Nigerian Social and Economic History, (Ife: University of Ife Press).

Lagos (1940). Nigerian Government Trade Report for the Year 1939

Lagos (1950). Nigeria: Oil Palm Produce Marketing Board, First Annual Report, 1949.

Lagos (1954). Sixth Annual Report of the Nigerian Oil Palm Produce Marketing Board.

Lugard FD (1905). England and France on the Niger (1895), no.150; Southern Nigeria and the 'Humanitarians' (Brussel), no. 43/1.

Martin A (1936). The Oil Palm Economy of the Ibibio Farmer.Ibadan. Nigeria (1937). Annual Report on the Agricultural Department.

Rodney W (1972). How Europe underdeveloped Africa, (Abuja, Lagos, Pretoria: Panaf Publishing, Inc.,)

Ryder AFC (1969). Benin and the Europeans, 1485 – 1897 (London: Longman Publishing Company).

Usoro EJ (1974). The Nigerian Oil Palm Industry (Government Policy and Export Production, 1906 – 1965), (Ibadan: Ibadan University Press).