Não informado. (1999). Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics.
Citação do estilo Chicago (17ª ed.)Não informado. Rocky Mountain Geology. Laramie, Wyo: University of Wyoming, Department of Geology and Geophysics, 1999.
Citação MLA (8ª ed.)Não informado. Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics, 1999.
警告：这些引文格式不一定是100％准确.