Não informado. (1972). Environmental Geology Report. Bureau of Topographic and Geologic Survey.
Chicagoスタイル(17版)引用形式Não informado. Environmental Geology Report. Harrisburg, Pa: Bureau of Topographic and Geologic Survey, 1972.
MLA(8版)引用形式Não informado. Environmental Geology Report. Bureau of Topographic and Geologic Survey, 1972.
警告: この引用は必ずしも正確ではありません.