- Author: Keith Walker Nicholas Fisher
- Language: English
- Year: 2010
- Author: Keith Wilson John Walker
- Language: English
- Year: 2010
- Author: Jearl Walker
- Language: English
- Year: 2007
- Author: Pamela Walker Elaine Wood
- Language: English
- Year: 2009
- Author: Nigel Ray Grant Walker
- Language: English
- Year: 1992
- Author: Nigel Ray Grant Walker
- Language: English
- Year: 1992
- Author: Nash J.C. Walker-Smith M.
- Language: English
- Year: 1995
- Author: Joseph C. Walker
- Language: English
- Year: 1786
- Author: Halliday Resnick and Walker's
- Language: Spanish
- Year: 2000