Não informado. (1972). Environmental Geology Report. Bureau of Topographic and Geologic Survey.
Style de citation Chicago (17e éd.)Não informado. Environmental Geology Report. Harrisburg, Pa: Bureau of Topographic and Geologic Survey, 1972.
Style de citation MLA (8e éd.)Não informado. Environmental Geology Report. Bureau of Topographic and Geologic Survey, 1972.
Attention : ces citations peuvent ne pas être correctes à 100%.