Cita APA (7a ed.)

Helle, H. J. (2015). The social thought of Georg Simmel. Sage.

Cita Chicago Style (17a ed.)

Helle, Horst Jurgen. The Social Thought of Georg Simmel. Los Angeles: Sage, 2015.

Cita MLA (9a ed.)

Helle, Horst Jurgen. The Social Thought of Georg Simmel. Sage, 2015.