APA (7e ed.) Bronvermelding

Não informado. (2004). Information Circular. Department of Natural Resources, Division of Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Information Circular. Columbus, Ohio: Department of Natural Resources, Division of Geological Survey, 2004.

MLA (8e ed.) Bronvermelding

Não informado. Information Circular. Department of Natural Resources, Division of Geological Survey, 2004.

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