Não informado. (2009). Occasional Publications of the Department of Geography. University of Illinois at Urbana-Champaign.
Chicago-Zitierstil (17. Ausg.)Não informado. Occasional Publications of the Department of Geography. Urbana, Ill: University of Illinois at Urbana-Champaign, 2009.
MLA-Zitierstil (8. Ausg.)Não informado. Occasional Publications of the Department of Geography. University of Illinois at Urbana-Champaign, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.