Cita APA (7a ed.)

Geological Survey, Schenk, C. J., Viger, R. J., & Anderson, C. P. (1999). MAPS showing geology, oil and fields and geologic provinces of South America. U. S. Geological Survey.

Cita Chicago Style (17a ed.)

Geological Survey, Christopher J. Schenk, Roland J. Viger, y Christopher P. Anderson. MAPS Showing Geology, Oil and Fields and Geologic Provinces of South America. Denver, CO.: U. S. Geological Survey, 1999.

Cita MLA (8a ed.)

Geological Survey, et al. MAPS Showing Geology, Oil and Fields and Geologic Provinces of South America. U. S. Geological Survey, 1999.