- Author: Knipe A. C., Watts W. E
- Language: English
- Year: 1982
- Author: Knipe A. C., Watts W. E
- Language: English
- Year: 1994
- Author: A.C. Knipe William Edward Watts
- Language: English
- Year: 1981
- Author: Knipe A.C. Watts W.E.
- Language: English
- Year: 2001
- Author: A. C. Knipe W. E. Watts
- Language: English
- Year: 2004
- Author: Chris Knipe W. E. Watts
- Language: English
- Year: 2002
- Author: Chris Knipe W. E. Watts
- Language: English
- Year: 1997
- Author: Chris Knipe W. E. Watts
- Language: English
- Year: 2009
- Author: Chris Knipe W. E. Watts
- Language: English
- Year: 2001
- Author: A.C. Knipe William Edward Watts
- Language: English
- Year: 1981