APA (7th ed.) Citation

Luhmann, N. (1995). Social systems. Stanford University Press.

Chicago Style (17th ed.) Citation

Luhmann, Niklas. Social Systems. Stanford, Calif: Stanford University Press, 1995.

MLA (9th ed.) Citation

Luhmann, Niklas. Social Systems. Stanford University Press, 1995.

Warning: These citations may not always be 100% accurate.