APA (7th ed.) Citation

Willke, H. (1989). Systemtheorie entwickelter Gesellschaften. Juventa.

Chicago Style (17th ed.) Citation

Willke, Helmut. Systemtheorie Entwickelter Gesellschaften. München: Juventa, 1989.

MLA (9th ed.) Citation

Willke, Helmut. Systemtheorie Entwickelter Gesellschaften. Juventa, 1989.

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