Não informado. (1999). Minnesota botanical studies. Geological and Natural History Survey of Minnesota.
Style de citation Chicago (17e éd.)Não informado. Minnesota Botanical Studies. Minneapolis, Minn: Geological and Natural History Survey of Minnesota, 1999.
Style de citation MLA (8e éd.)Não informado. Minnesota Botanical Studies. Geological and Natural History Survey of Minnesota, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.