Não informado. (1982). National Water Conditions. U.S. Department of the Interior, Geological Survey.
Style de citation Chicago (17e éd.)Não informado. National Water Conditions. Reston, Va: U.S. Department of the Interior, Geological Survey, 1982.
Style de citation MLA (8e éd.)Não informado. National Water Conditions. U.S. Department of the Interior, Geological Survey, 1982.
Attention : ces citations peuvent ne pas être correctes à 100%.