Great Britain. Office of Commonwealth Relations. (1961). Incorporation of the Northern Cameroons into the Federation of Nigeria: Exchange of letters between the Government of the United Kingdom and the Government of the Federation of Nigeria. H.M.S.O..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Great Britain. Office of Commonwealth Relations. Incorporation of the Northern Cameroons into the Federation of Nigeria: Exchange of Letters Between the Government of the United Kingdom and the Government of the Federation of Nigeria. London: H.M.S.O., 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Great Britain. Office of Commonwealth Relations. Incorporation of the Northern Cameroons into the Federation of Nigeria: Exchange of Letters Between the Government of the United Kingdom and the Government of the Federation of Nigeria. H.M.S.O., 1961.