- Author: Sarah Helen Davies
- Language: English
- Year: 2020
- Author: Helen Davies
- Language: Hungarian
- Year: 2014
- Author: Helen Davies Horváth Csaba
- Language: Hungarian
- Year: 2005
- Author: Helen Davies Sarah Ilott
- Language: English
- Year: 2018
- Author: Helen Davies Nicole Irving
- Language: English, Spanish
- Year: 1989
- Author: Helen Davies (auth.)
- Language: English
- Year: 2012
- Author: Helen Davies Stefanie Steiner John Shackell
- Language: German
- Year: 2002
- Author: Helen Davies Horváh Csaba
- Language: Hungarian
- Author: Helen Davies Nicole Irving
- Language: English
- Year: 1989
- Author: Helen Davies Stefanie Steiner John Shackell
- Language: German
- Year: 2002