Não informado. Topographic instructions of the United States Geological Survey. U.S. Department of the Interior.
Chicagoスタイル(17版)引用形式Não informado. Topographic Instructions of the United States Geological Survey. Washington: U.S. Department of the Interior.
MLA(8版)引用形式Não informado. Topographic Instructions of the United States Geological Survey. U.S. Department of the Interior.
警告: この引用は必ずしも正確ではありません.