Não informado. (1981). Mountain Research and Development. United Nations University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Mountain Research and Development. Boulder, Colo: United Nations University, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Mountain Research and Development. United Nations University, 1981.
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