APA (7e ed.) Bronvermelding

Não informado. (1914). Bulletin of the Minnesota Geological Survey. University of Minnesota.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin of the Minnesota Geological Survey. Minneapolis, Minn: University of Minnesota, 1914.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin of the Minnesota Geological Survey. University of Minnesota, 1914.

Let op: Deze citaties zijn niet altijd 100% accuraat.