Não informado. Miscellaneous map series. Minnesota Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Miscellaneous Map Series. Saint Paul, Minn: Minnesota Geological Survey.
MLA(8版)引用形式Não informado. Miscellaneous Map Series. Minnesota Geological Survey.
警告: この引用は必ずしも正確ではありません.