Primary sources:
- Official Gazette. Federation of Nigeria : Official Gazette (No. 54, 1 Oct 1954 - No. 77, Extra, 30 Sep 1963) || Federal Republic of Nigeria : Official Gazette (Extra, No. 78, 1 Oct 1963- Extra, No. 51, 24 May 1966; No. 86, 1 Sep 1966-) || The Republic of Nigeria : Official Gazette (No. 51, 26 May 1966 - Extra, No. 85, 1 Sep 1966). online: 1958-1989
Selected sources:
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