- Author: Gary Chapman, Ross Campbell
- Language: English
- Year: 2016
- Author: Gary Chapman Ross Campbell
- Language: English
- Year: 2011
- Author: Gary Chapman Ross Campbell
- Language: English
- Year: 2016
- Author: Gary Chapman, Ross Campbell
- Language: Portuguese
- Year: 2020
- Author: Gary Chapman Ross Campbell
- Language: Hungarian
- Year: 2010
- Author: Gary Chapman Ross Campbell
- Language: English
- Year: 2012