Gaya APA

Albert, M., Hilkermeier, L. (2004). Observing International Relations Niklas Luhmann and world politics . USA and Canada by Routledge 29: Routledge taylor and francis group.

Gaya MLA

Albert, Mathias-ed., Hilkermeier, Lena-ed. "Observing International Relations Niklas Luhmann and world politics". USA and Canada by Routledge 29: Routledge taylor and francis group, 2004. Text.