Não informado. The Mountain Geologist. Rocky Mountain Association of Geologists.
Chicago-referens (17:e uppl.)Não informado. The Mountain Geologist. Denver, Colo: Rocky Mountain Association of Geologists.
MLA-referens (8:e uppl.)Não informado. The Mountain Geologist. Rocky Mountain Association of Geologists.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.