- Author: John Butt, Carmen Benjamin
- Language: English
- Year: 2011
- Author: Antonia Moreira Rodríguez, John Butt, Carmen Benjamin
- Language: English
- Year: 2019
- Author: John B. Butt John Butt Carmen Benjamin
- Language: English
- Year: 2011
- Author: John Butt Carmen Benjamin (auth.)
- Language: English
- Year: 1989