Não informado. (2011). U.S. Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey.
Style de citation Chicago (17e éd.)Não informado. U.S. Geological Survey Bulletin. Washington: U.S. Department of the Interior, Geological Survey, 2011.
Style de citation MLA (8e éd.)Não informado. U.S. Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey, 2011.
Attention : ces citations peuvent ne pas être correctes à 100%.