Não informado. (1999). Minnesota botanical studies. Geological and Natural History Survey of Minnesota.
Lua i Stíl Chicago (17ú heag.)Não informado. Minnesota Botanical Studies. Minneapolis, Minn: Geological and Natural History Survey of Minnesota, 1999.
Lua MLA (8ú heag.)Não informado. Minnesota Botanical Studies. Geological and Natural History Survey of Minnesota, 1999.
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