- Author: Robert Keller
- Language: English
- Year: 2023
- Author: Timothy Keller, John Inazu
- Language: English
- Year: 2020
- Author: Robert Keller
- Language: English
- Year: 2021
- Author: Robert Keller
- Language: English
- Year: 2022
- Author: Samuel Keller, Inger Oterholm, Veronika Paulsen, Adrian van Breda (editors)
- Language: English
- Year: 2023
- Author: Jasmin Webinger, Daniela Keller, Barbara Budrich
- Language: German
- Year: 2014
- Author: Karl Hauck (editor), Hagen Keller (editor), Christel Meier (editor)
- Language: German
- Year: 1999
- Author: Karl Hauck (editor), Hagen Keller (editor), Joachim Wollasch (editor), H. Keller (editor), C. Gnilka (editor), P. Sevrugian (editor)
- Language: German
- Year: 1992
- Author: Karl Hauck (editor), Hagen Keller (editor), Christel Meier (editor)
- Language: German
- Year: 1998
- Author: Karl Hauck (editor), Keller Hagen (editor), Christel Maier (editor)
- Language: German
- Year: 1997