Não informado. (1999). Minnesota botanical studies. Geological and Natural History Survey of Minnesota.
Chicagoスタイル(17版)引用形式Não informado. Minnesota Botanical Studies. Minneapolis, Minn: Geological and Natural History Survey of Minnesota, 1999.
MLA(8版)引用形式Não informado. Minnesota Botanical Studies. Geological and Natural History Survey of Minnesota, 1999.
警告: この引用は必ずしも正確ではありません.