- Author: Alexander Charles K, Sadiku Matthew N O
- Language: English
- Year: 2016
- Author: Sadiku Matthew
- Language: Spanish
- Author: Sadiku Matthew N. O
- Language: English
- Year: 2018
- Author: Sadiku Matthew N. O
- Language: English
- Year: 2019
- Author: Abood Samir I., Ali Warsame Hassan, Sadiku Matthew N. O
- Language: English
- Year: 2019
- Author: Ilyas Mohammad, Sadiku Matthew N. O
- Language: English
- Year: 1995