- Author: Sima Godfrey (editor), Frank Unger (editor)
- Language: English
- Year: 2004
- Author: Daniel Unger (editor)
- Language: English
- Year: 2022
- Author: Heinrich Hartmann (editor), Corinna R. Unger (editor)
- Language: English
- Year: 2014
- Author: Gerhard Heitz (editor), Manfred Unger (editor)
- Language: German
- Year: 1962
- Author: Heinrich Sproemberg (editor), Manfred Unger (editor)
- Language: German
- Year: 1971
- Author: W. N. Wapnik (editor), A. J. Tscherwonenkis (editor), Siegfried Unger (editor), Klaus Fritzsch (editor)
- Language: German
- Year: 1980
- Author: Corinna R. Unger (editor), Nicholas Ferns (editor), Jack Loveridge (editor), Iris Borowy (editor)
- Language: English
- Year: 2022