Não informado. (1999). Miscellaneous Series. North Dakota Geological Survey.
Style de citation Chicago (17e éd.)Não informado. Miscellaneous Series. Grand Forks, ND: North Dakota Geological Survey, 1999.
Style de citation MLA (8e éd.)Não informado. Miscellaneous Series. North Dakota Geological Survey, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.