- Author: Wolfgang Hartmann, Institut für Soziologie der Akademie der Wissenschaften der DDR
- Language: German
- Year: 2022
- Author: Hartmann (editor), Ludwig Wolff (editor), G. F. Benecke (editor), K. Lachmann (editor)
- Language: German
- Year: 1966
- Author: Frederik Hartmann
- Language: English
- Year: 2023
- Author: Clair Hayden Bell der Gartenaere Wernher von Aue Hartmann
- Language: English
- Year: 1968
- Author: William M. Hartmann
- Language: English
- Author: Nicolai Hartmann
- Language: Spanish
- Author: Nicolai Hartmann
- Language: Spanish
- Author: Ivar Hartmann
- Language: Portuguese
- Author: Anna-Maria Hartmann
- Language: English
- Year: 2018