- Author: Van Niekerk Neil
- Language: English
- Year: 2011
- Author: Van Niekerk Neil
- Language: English
- Year: 2013
- Author: David Suzuki Foundation., Hall David
- Language: English
- Year: 2011
- Author: Fletcher Dirk
- Language: English
- Year: 2013
- Author: Patrick Keating
- Language: English
- Year: 2009
- Author: Farace Joe
- Language: English
- Year: 2013