APA

American Association of Stratigraphic Palynologists, American Institute of Professional Geologists, Association of American State Geologists, Association of Engineering Geologists, Association of Geoscientists for International Development, Colorado Scientific Society, Geological Society of America, Mineralogical Society of America, National Association of Geoscience Teachers, Paleopathological Research Institution, Paleopathological Society, Rocky mountain Association of geologists, SEPM (Society for Sedimentary Geology), Society of Vertebrate Paleontology, The Geological Society of America & University of Colorado B. (1999). Annual Meeting and Exposition. Washington, D.C: The Geological Society of America.

Chicago

American Association of Stratigraphic Palynologists, American Institute of Professional Geologists, Association of American State Geologists, Association of Engineering Geologists, Association of Geoscientists for International Development, Colorado Scientific Society, Geological Society of America, Mineralogical Society of America, National Association of Geoscience Teachers, Paleopathological Research Institution, Paleopathological Society, Rocky mountain Association of geologists, SEPM (Society for Sedimentary Geology), Society of Vertebrate Paleontology, The Geological Society of America and University of Colorado Boulder. 1999. Annual Meeting and Exposition. Washington, D.C: The Geological Society of America.

Harvard

American Association of Stratigraphic Palynologists, American Institute of Professional Geologists, Association of American State Geologists, Association of Engineering Geologists, Association of Geoscientists for International Development, Colorado Scientific Society, Geological Society of America, Mineralogical Society of America, National Association of Geoscience Teachers, Paleopathological Research Institution, Paleopathological Society, Rocky mountain Association of geologists, SEPM (Society for Sedimentary Geology), Society of Vertebrate Paleontology, The Geological Society of America and University of Colorado B. (1999). Annual Meeting and Exposition. Washington, D.C: The Geological Society of America.

MLA

American Association of Stratigraphic Palynologists, American Institute of Professional Geologists, Association of American State Geologists, Association of Engineering Geologists, Association of Geoscientists for International Development, Colorado Scientific Society, Geological Society of America, Mineralogical Society of America, National Association of Geoscience Teachers, Paleopathological Research Institution, Paleopathological Society, Rocky mountain Association of geologists, SEPM (Society for Sedimentary Geology), Society of Vertebrate Paleontology, The Geological Society of America and University of Colorado Boulder. Annual Meeting and Exposition. Washington, D.C: The Geological Society of America. 1999.