
- Author: Breidlid Anders, Cheyeka Austin M., Farag Alawia Ibrahim
- Language: English
- Year: 2015

- Author: Francisca Ayodeji Akala, Carol Jenkins
- Language: English
- Year: 2005

- Author: Obijiofor Aginam, Martin R. Rupiya
- Language: English
- Year: 2012

- Author: Hazel Barnes
- Language: English
- Year: 2013

- Author: Lomborg Bjørn
- Language: English
- Year: 2012