- Author: Harry Walker
- Language: English
- Year: 2012
- Author: Iza Kavedzija, Harry Walker, Joel Robbins
- Language: English
- Year: 2017
- Author: Mathijs Pelkmans Harry Walker
- Language: English
- Year: 2022
- Author: Mathijs Pelkmans (editor) Harry Walker (editor)
- Language: English
- Year: 2023
- Author: Harry Walker
- Language: English
- Year: 2013