1. Transport development;Adesanya,1998
2. Akpogomeh, O.S., 2002. Transport and communication. In: Africa Atlas of Nigeria. Les Editions J.A., 57 bis, rue d’ Autenil, 750 16 Paris, France, pp. 106–109.
3. Influence of biological age on professional efficiency: communication 1. Biological age and mental efficiency;Bashkireva;Human Physiology,2001
4. Maritime transport in the Nigerian economy;Badejo,1998
5. Social Research Methods;Bryman,2008