APA (7e ed.) Bronvermelding

Não informado. Oil and Gas Investigations. State Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Oil and Gas Investigations. Lawrence, Kan: State Geological Survey.

MLA (8e ed.) Bronvermelding

Não informado. Oil and Gas Investigations. State Geological Survey.

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