- Author: Niklas Luhmann (auth.)
- Language: German
- Year: 1975
- Author: Niklas Luhmann Jeremy Gaines Doris L. Jones
- Language: English
- Year: 1987
Love: A Sketch
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- Language: English
- Year: 2010
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- Year: 2010
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- Language: German
- Year: 2003
- Author: Niklas Luhmann
- Language: English
- Year: 1990
- Author: Niklas Luhmann
- Language: German
- Year: 1996
- Author: Niklas Luhmann
- Language: English
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- Author: Niklas Luhmann
- Language: English
- Year: 1996
- Author: Niklas Luhmann
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- Year: 2011