APA (7e ed.) Bronvermelding

Não informado. (1999). Miscellaneous Series. North Dakota Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Miscellaneous Series. Grand Forks, ND: North Dakota Geological Survey, 1999.

MLA (8e ed.) Bronvermelding

Não informado. Miscellaneous Series. North Dakota Geological Survey, 1999.

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