- Author: Carmen Păunescu, Katri-Liis Lepik, Nicholas Spencer
- Language: English
- Year: 2021
- Author: Nicholas Spencer
- Language: English
- Author: Nicholas Spencer
- Language: English
- Year: 2023
- Author: Nicholas Spencer
- Language: English
- Year: 2014
- Author: Nicholas Spencer
- Language: English
- Year: 2006