- Author: Richard Tabulawa
- Language: English
- Year: 2013
- Author: Mackreth D. F
- Language: English
- Year: 2011
- Author: D. F. Mackreth
- Language: English
- Year: 2011
- Author: Jacobs Peter
- Language: English
- Year: 2013
- Author: Jacobs Peter
- Language: English
- Year: 2013