- Author: Matthias Bauer, Angelika Zirker, Olga Fischer, Christina Ljungberg
- Language: English
- Year: 2017
- Author: Sybille Krämer (editor), Christina Ljungberg (editor)
- Language: English
- Year: 2016
- Author: Pamela Perniss (editor) Olga Fischer (editor) Christina Ljungberg (editor)
- Language: English
- Year: 2020
- Author: Sybille Krämer Christina Ljungberg
- Language: English
- Year: 2016
- Author: Lars Elleström Olga Fischer Christina Ljungberg
- Language: English
- Year: 2013
- Author: Pascal Michelucci Dr. Olga Fischer Christina Ljungberg
- Language: English
- Year: 2011
- Author: Pascal Michelucci Dr. Olga Fischer Christina Ljungberg
- Language: English
- Year: 2011
- Author: C. Jac Conradie Ronel Johl Marthinus Beukes Olga Fisher Christina Ljungberg
- Language: English
- Year: 2010