- Author: Timothy K. Perttula, Chester P. Walker
- Language: English
- Year: 2012
- Author: Allan Walker, Clive Dimmock
- Language: English
- Year: 2002
- Author: Krista Jensen, Carla Kelly, Sian Ann Bessey, Anneka Walker
- Language: English
- Year: 2020
- Author: William G. Gale, J. Mark Iwry, David C. John, Lina Walker
- Language: English
- Year: 2009
- Author: Marcie Alvis Walker
- Language: English
- Year: 2023
- Author: Wayne Walker
- Language: English
- Year: 2023
- Author: Tamara J. Walker
- Language: English
- Year: 2023
- Author: Mary Jane Walker
- Language: English
- Year: 2021
- Author: Darren Walker
- Language: English
- Year: 2023
- Author: Cameron Walker
- Language: English
- Year: 2023