Cita APA (7a ed.)

Albert, M., & Hilkermeier, L. (2004). Observing international relations: Niklas Luhmann and world politics. Routledge.

Cita Chicago Style (17a ed.)

Albert, Mathias, y Lena Hilkermeier. Observing International Relations: Niklas Luhmann and World Politics. London ; New York: Routledge, 2004.

Cita MLA (8a ed.)

Albert, Mathias, y Lena Hilkermeier. Observing International Relations: Niklas Luhmann and World Politics. Routledge, 2004.