- Author: Mark Duffield
- Language: English
- Year: 2014
- Author: Mark Duffield
- Language: English
- Year: 2007
- Author: Mark Duffield
- Language: English
- Year: 2018
- Author: Vernon Hewitt Mark Duffield
- Language: English
- Year: 2009
- Author: Mark Duffield
- Language: Italian
- Year: 2004
- Author: Mark Duffield
- Language: Italian
- Year: 2004
- Author: Mark Duffield
- Language: English
- Year: 2001