Não informado. (2014). Geological Survey Professional Paper. U.S. Geological Survey Professional Paper.
Style de citation Chicago (17e éd.)Não informado. Geological Survey Professional Paper. Washington: U.S. Geological Survey Professional Paper, 2014.
Style de citation MLA (8e éd.)Não informado. Geological Survey Professional Paper. U.S. Geological Survey Professional Paper, 2014.
Attention : ces citations peuvent ne pas être correctes à 100%.