Cita APA (7a ed.)

Não informado. (2001). Annual report of the United States Geological Survey. U.S. Geological Survey.

Cita Chicago Style (17a ed.)

Não informado. Annual Report of the United States Geological Survey. Washington: U.S. Geological Survey, 2001.

Cita MLA (8a ed.)

Não informado. Annual Report of the United States Geological Survey. U.S. Geological Survey, 2001.

Precaución: Estas citas no son 100% exactas.