Não informado. (1966). Abstracts of North American geology. U.S. Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Abstracts of North American Geology. Washington: U.S. Geological Survey, 1966.
MLA(8版)引用形式Não informado. Abstracts of North American Geology. U.S. Geological Survey, 1966.
警告: この引用は必ずしも正確ではありません.