- Author: Victor Okafor, Victor Oguejiofor Okafor
- Language: English
- Year: 2008
- Author: Adebayo Oyebade, Abiodun Alao, Victor Oguejiofor Okafor, Sheriffdeen A. Tella, Amadu Sesay, Funmi Olonisakin, Ayele Bekerie
- Language: English
- Year: 1998
- Author: Victor Oguejiofor Okafor
- Language: English
- Year: 2006