- Author: Nicolai Hartmann (editor), Gerald Hartung (editor), Matthias Wunsch (editor)
- Language: German
- Year: 2014
- Author: Klaus Hartmann (editor)
- Language: German
- Year: 1975
- Author: Ulrich Gähde (editor), Stephan Hartmann (editor), Jörn Henning Wolf (editor)
- Language: English
- Year: 2013
- Author: R. Hartmann
- Language: German
- Year: 1876
- Author: Nicolai Hartmann
- Language: German
- Year: 1940
- Author: Nicolai Hartmann
- Language: German
- Year: 1950
- Author: Wilfried Hartmann
- Language: German
- Year: 2007
- Author: Christian Hartmann (editor)
- Language: German
- Year: 2008