- Author: Alan Barker
- Language: English
- Year: 2019
- Author: Alan Barker
- Language: English
- Year: 2013
- Author: Alan Barker Kathryn Knapp (auth.)
- Language: English
- Year: 1990
- Author: Alan Barker
- Language: English
- Year: 2013
- Author: Alan Barker
- Language: English
- Year: 2011
- Author: Alan Barker
- Language: English
- Year: 2006
- Author: Alan Barker
- Language: English
- Year: 2010
- Author: Alan Barker
- Language: English
- Year: 1997
- Author: Alan Barker
- Language: English
- Year: 1997
- Author: Alan Barker
- Language: English
- Year: 2007