- Author: Francis Nwonwu
- Language: English
- Year: 2007
- Author: Korwa G. Adar, Richard O. Iroanya, Francis Nwonwu
- Language: English
- Year: 2007
- Author: Francis Nwonwu, Dirk Kotze
- Language: English
- Year: 2007
- Author: Francis Nwonwu
- Language: English
- Year: 2007
- Author: Korwa G. Adar, Richard O. Iroanya, Francis Nwonwu
- Language: English
- Year: 2007
- Author: Francis Nwonwu, Dirk Kotze
- Language: English
- Year: 2007