Não informado. (1980). Singapore journal of tropical geography. National University od Singapore, Department of Geography.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Singapore Journal of Tropical Geography. Singapore: National University od Singapore, Department of Geography, 1980.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Singapore Journal of Tropical Geography. National University od Singapore, Department of Geography, 1980.
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