Não informado. (1999). Geological survey water supply paper. U.S. Geological Survey.
Style de citation Chicago (17e éd.)Não informado. Geological Survey Water Supply Paper. Washington: U.S. Geological Survey, 1999.
Style de citation MLA (8e éd.)Não informado. Geological Survey Water Supply Paper. U.S. Geological Survey, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.