Cita APA (7a ed.)

Horster, D. (1997). Niklas Luhmann. Verlag C. H. Beck.

Cita Chicago Style (17a ed.)

Horster, Detlef. Niklas Luhmann. München: Verlag C. H. Beck, 1997.

Cita MLA (9a ed.)

Horster, Detlef. Niklas Luhmann. Verlag C. H. Beck, 1997.