Não informado. (1972). General Technical Report RM. Rocky Mountain Forest and Range Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. General Technical Report RM. Fort Collins, Colo: Rocky Mountain Forest and Range Experiment Station, 1972.
Lua MLA (8ú heag.)Não informado. General Technical Report RM. Rocky Mountain Forest and Range Experiment Station, 1972.
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