Não informado. (2004). Information Circular. Department of Natural Resources, Division of Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Information Circular. Columbus, Ohio: Department of Natural Resources, Division of Geological Survey, 2004.
MLA(8版)引用形式Não informado. Information Circular. Department of Natural Resources, Division of Geological Survey, 2004.
警告: この引用は必ずしも正確ではありません.