Cita APA (7th ed.)

Horster, D. (1997). Niklas Luhmann (Orig.ausg.). Beck.

Cita Chicago (17th ed.)

Horster, Detlef. Niklas Luhmann. Orig.ausg. München: Beck, 1997.

Cita MLA (8th ed.)

Horster, Detlef. Niklas Luhmann. Orig.ausg. Beck, 1997.