- Author: Nicolaus Balla, Courtney Burns
- Language: English
- Year: 2014
- Author: Jochen Balla
- Language: German
- Year: 2020
- Author: Balla Nicolaus, Burns Cortney, Newberry Jan
- Language: English
- Year: 2014
- Author: Paul Kalligas (editor), Chloe Balla (editor), Effie Baziotopoulou-Valavani (editor), Vassilis Karasmanis (editor)
- Language: English
- Year: 2020
- Author: Jochen Balla
- Language: German
- Year: 2018
- Author: Balla-Arabe Souleymane, Li Chao, Yang Fan
- Language: English
- Year: 2017
- Author: Balla Jiri Duong Van Yen.
- Language: English
- Author: Balla J. Layer F.
- Language: English
- Author: Cortney Burns Nicolaus Balla Chad Robertson
- Language: English
- Year: 2014