Não informado. (2021). Cooperative Resources Report. State Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Cooperative Resources Report. Urbana, Ill: State Geological Survey, 2021.
MLA(8版)引用形式Não informado. Cooperative Resources Report. State Geological Survey, 2021.
警告: この引用は必ずしも正確ではありません.