Não informado. (1972). General Technical Report RM. Rocky Mountain Forest and Range Experiment Station.
Chicago-referens (17:e uppl.)Não informado. General Technical Report RM. Fort Collins, Colo: Rocky Mountain Forest and Range Experiment Station, 1972.
MLA-referens (8:e uppl.)Não informado. General Technical Report RM. Rocky Mountain Forest and Range Experiment Station, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.