Não informado. (1958). Journal of tropical geography. University of Singapore, Department of Geography.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Tropical Geography. Singapore: University of Singapore, Department of Geography, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Tropical Geography. University of Singapore, Department of Geography, 1958.
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