Não informado. (1999). Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics.
Chicago-referens (17:e uppl.)Não informado. Rocky Mountain Geology. Laramie, Wyo: University of Wyoming, Department of Geology and Geophysics, 1999.
MLA-referens (8:e uppl.)Não informado. Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.