Cita APA (7a ed.)

Geologica Survey, Persits, F., Ahlbrandt, T., Tuttle, M., Charpentier, R., Brownfield, M., & Takahashi, K. (1997). MAPS showing geology, oil and gas fields and geological provinces of Africa. U. S. Geological Survey.

Cita Chicago Style (17a ed.)

Geologica Survey, Feliks Persits, Thomas Ahlbrandt, Michele Tuttle, Ronald Charpentier, Michael Brownfield, y Kenneth Takahashi. MAPS Showing Geology, Oil and Gas Fields and Geological Provinces of Africa. Denver, CO. : 556: U. S. Geological Survey, 1997.

Cita MLA (8a ed.)

Geologica Survey, et al. MAPS Showing Geology, Oil and Gas Fields and Geological Provinces of Africa. U. S. Geological Survey, 1997.