African Population Conference University of Ibadan, University of Ibadan, Population Council, Caldwell, J. C., & Okonjo, C. (1968). The population of Tropical Africa: [proceedings of the First African Population Conference sponsored by the University of Ibadan in co-operation with the Population Council and held at the University of Ibadan, Nigeria, 3-7 Jan. 1966]. Longmans.

African Population Conference University of Ibadan, University of Ibadan, Population Council, John C. Caldwell, a Chukuka Okonjo. The Population of Tropical Africa: [proceedings of the First African Population Conference Sponsored by the University of Ibadan in Co-operation with the Population Council and Held at the University of Ibadan, Nigeria, 3-7 Jan. 1966]. [London]: Longmans, 1968.

African Population Conference University of Ibadan, et al. The Population of Tropical Africa: [proceedings of the First African Population Conference Sponsored by the University of Ibadan in Co-operation with the Population Council and Held at the University of Ibadan, Nigeria, 3-7 Jan. 1966]. Longmans, 1968.