Não informado. (1972). General Technical Report RM. Rocky Mountain Forest and Range Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. General Technical Report RM. Fort Collins, Colo: Rocky Mountain Forest and Range Experiment Station, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. General Technical Report RM. Rocky Mountain Forest and Range Experiment Station, 1972.
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