- Author: Walker Bill J.
- Language: English
- Year: 2020
- Author: Walker Bill J.
- Language: English
- Year: 2020
- Author: Walker Bill
- Language: English
- Year: 2013
- Author: Walker Bill
- Language: English
- Year: 2008
- Author: Walker Bill
- Language: English
- Year: 2010
- Author: Hilary Walker Bill Beaumont (eds.)
- Language: English
- Year: 1985