APA (7th ed.) Citation

Spykman, N. J. (1925). The social Theory of Georg Simmel. The University of Chicago Press.

Chicago Style (17th ed.) Citation

Spykman, Nicholas J. The Social Theory of Georg Simmel. Chicago: The University of Chicago Press, 1925.

MLA (9th ed.) Citation

Spykman, Nicholas J. The Social Theory of Georg Simmel. The University of Chicago Press, 1925.