- Author: Augustin Fosu, Germano Mwabu, Erik Thorbecke
- Language: English
- Year: 2008
- Author: Thomas N. Kibua, Germano Mwabu
- Language: English
- Year: 2004
- Author: Augustin Kwasi Fosu, Germano Mwabu
- Language: English
- Year: 2007
- Author: Augustin Fosu, Germano Mwabu, Erik Thorbecke
- Language: English
- Year: 2008
- Author: Thomas N. Kibua, Germano Mwabu
- Language: English
- Year: 2004
- Author: Augustin Kwasi Fosu, Germano Mwabu
- Language: English
- Year: 2007