- Author: Europäische Union, European Union, De Vries Catherine E
- Language: English
- Year: 2018
- Author: Europäische Union, European Union, Tsoukalis Loukas
- Language: English
- Year: 2016
- Author: Sabine Saurugger
- Language: English
- Year: 2014
- Author: Borowik Irena, Ramet Sabrina P
- Language: English
- Year: 2017
- Author: Ferrín Mónica, Kriesi Hanspeter
- Language: English
- Year: 2016