Não informado. (2009). Occasional Publications of the Department of Geography. University of Illinois at Urbana-Champaign.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Occasional Publications of the Department of Geography. Urbana, Ill: University of Illinois at Urbana-Champaign, 2009.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Occasional Publications of the Department of Geography. University of Illinois at Urbana-Champaign, 2009.
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