Cita APA (7a ed.)

U.S. Geological Survey. Mineral industry surveys , copper in april 2006.

Cita Chicago Style (17a ed.)

U.S. Geological Survey. Mineral Industry Surveys , Copper in April 2006.

Cita MLA (9a ed.)

U.S. Geological Survey. Mineral Industry Surveys , Copper in April 2006.

Precaución: Estas citas no son 100% exactas.