APA (7th ed.) Citation

Luhmann, N., & Ziegert,Niklas. (2004). Law as a social system. Oxford University press.

Chicago Style (17th ed.) Citation

Luhmann, Niklas, and Ziegert,Niklas. Law as a Social System. Oxford: Oxford University press, 2004.

MLA (9th ed.) Citation

Luhmann, Niklas, and Ziegert,Niklas. Law as a Social System. Oxford University press, 2004.