APA (7e ed.) Bronvermelding

Não informado. (1999). Special report. Wisconsin Geological and Natural History Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Special Report. Madison, Wis: Wisconsin Geological and Natural History Survey, 1999.

MLA (8e ed.) Bronvermelding

Não informado. Special Report. Wisconsin Geological and Natural History Survey, 1999.

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