1. Ajibade, A. C.: The Geology of Zungeru area, Univ. of Ibadan, M. Sc. Thesis (Unpublished), 1972.
2. Andrews-Jones, D. A.: Petrogenesis and geochemistry of the rocks of the Kenema district, Sierra Leone, 12th Ann. Rep. Res. Inst. Afr. Geol. Univ. Leeds, p. 20, 1968.
3. Betrand, J. M. L. &Lassere, M.: Pan African and Pre-Pan. African history of the Hoggar (Algerian Sahara) in the light of new geochronological data from the Aleksod area. Precambrian Res. 3: 343–362, 1976.
4. Bonhomme, M.: Contribution a l'étude géochronologique de la plate-forme de l'Ouest Africain. Ann. Fac. Sci. Univ. Clermont, Ser. Geol. 5 p. 62, 1962.
5. Burke, K. C. &Dewey, F. J.: Orogeny in Africa in Afr. Geol. Ibadan. Eds. Dessauvagie and Whiteman, Ibadan Univ. Press, pp. 583–608, 1972.