Cita APA

Colorado Geological Survey, Tweto, O. 1., & Schoenfeld, R. E. Geologic map of Colorado. Reston, Va. : 1979: Department of the Interior, U.S. Geological Survey.

Citación estilo Chicago

Colorado Geological Survey, Ogden 1912-1983 Tweto, y R. E. Schoenfeld. Geologic Map of Colorado. Reston, Va. : 1979: Department of the Interior, U.S. Geological Survey.

Cita MLA

Colorado Geological Survey, Ogden 1912-1983 Tweto, y R. E. Schoenfeld. Geologic Map of Colorado. Reston, Va. : 1979: Department of the Interior, U.S. Geological Survey.