- Author: r4Educated Solutions
- Language: English
- Year: 1993
- Author: Maslen Bobby Lynn, Maslen John R
- Language: English
- Year: 2006
- Author: Maslen Bobby Lynn, Maslen John R
- Language: English
- Year: 2018
- Author: Maslen Bobby Lynn, Maslen John R
- Language: English
- Year: 2018
- Author: Beynon Alison
- Language: English
- Year: 2013