Não informado. (2011). Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Geological Survey Bulletin. Washington: U.S. Department of the Interior, Geological Survey, 2011.
MLA(8版)引用形式Não informado. Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey, 2011.
警告: この引用は必ずしも正確ではありません.