Não informado. (2020). USDA Forest Service Resource Bulletin INT. US Department of Agriculture, Intermountain Forest and Range Experiment Station.
Chicago-referens (17:e uppl.)Não informado. USDA Forest Service Resource Bulletin INT. Ogden, Utah: US Department of Agriculture, Intermountain Forest and Range Experiment Station, 2020.
MLA-referens (8:e uppl.)Não informado. USDA Forest Service Resource Bulletin INT. US Department of Agriculture, Intermountain Forest and Range Experiment Station, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.