1. Port cities and the international trade of Ghana;Addo;African Urban Quarterly,1994
2. Railways Across the Equator. The Story of the East African Line;Amin,1986
3. Transport and Trade;Barke,1986
4. Seaports and Seaport Terminals;Bird,1971
5. Seaports as a subset of gateways for regions;Bird;Progress in Human Geography,1980