- Author: Andrada Fatu-Tutoveanu, Rubén Jarazo Álvarez
- Language: English
- Year: 2013
- Author: Georgeta Raţă, Patricia-Luciana Runcan
- Language: English
- Year: 2013
- Author: Natalia Vlas, Vasile Boari
- Language: English
- Year: 2013
- Author: Flonta Pavel, Flonta Teodor
- Language: English
- Year: 2012